General solution of the differential equation calculator - A differential equation. y + p(x)y = g(x)yα, where α is a real number not equal to 0 or 1, is called a Bernoulli differential equation. It is named after Jacob (also known as James or Jacques) Bernoulli (1654--1705) who discussed it in 1695. Jacob Bernoulli was born in Basel, Switzerland. Following his father's wish, he studied theology and ...

 
Explain what is meant by a solution to a differential equation. Distinguish between the general solution and a particular solution of a differential equation. …. Marble falls isd pay scale

Find the general solution of the given differential equation. 7 dy dx + 56y = 8. y (x) =. Give the largest interval I over which the general solution is defined. (Think about the implications of any singular points. Enter your answer using interval notation.) Determine whether there are any transient terms in the general solution.Find the general solution of the differential equation dr/dt = (3 + 6t, 3t) r(t)=_____+C Find the solution with the initial condition r(0) = (4,7) r(t)=_____ This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts.Free Method of Frobenius ODE Calculator - solve ODE using the method of Frobenius step by stepTo solve a trigonometric simplify the equation using trigonometric identities. Then, write the equation in a standard form, and isolate the variable using algebraic manipulation to solve for the variable. Use inverse trigonometric functions to find the solutions, and check for extraneous solutions.Thus, f (x)=e^ (rx) is a general solution to any 2nd order linear homogeneous differential equation. To find the solution to a particular 2nd order linear homogeneous DEQ, we can plug in this general solution to the equation at hand to find the values of r that satisfy the given DEQ.differential equation solver. Have a question about using Wolfram|Alpha? Contact Pro Premium Expert Support ». Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. For math, science, nutrition, history, geography, engineering, mathematics, linguistics, sports, finance ...These types of differential equations are called Euler Equations. Recall from the previous section that a point is an ordinary point if the quotients, have Taylor series around \ ( {x_0} = 0\). However, because of the \ (x\) in the denominator neither of these will have a Taylor series around \ ( {x_0} = 0\) and so \ ( {x_0} = 0\) is a singular ...Verify the Differential Equation Solution. y' = 3x2 y ′ = 3 x 2 , y = x3 − 4 y = x 3 - 4. Find y' y ′. Tap for more steps... y' = 3x2 y ′ = 3 x 2. Substitute into the given differential equation. 3x2 = 3x2 3 x 2 = 3 x 2. The given solution satisfies the given differential equation.Free linear first order differential equations calculator - solve ordinary linear first order differential equations step-by-stepThe Wolfram Language function DSolve finds symbolic solutions to differential equations. (The Wolfram Language function NDSolve, on the other hand, is a general numerical differential equation solver.) DSolve can handle the following types of equations:. Ordinary Differential Equations (ODEs), in which there is a single independent variable …Advanced Math. Advanced Math questions and answers. In Exercises 5-24, find the general solution of the differential equation specified. (You may not be able to reach the ideal answer of an equation with only the dependent vari- able on the left and only the independent variable on the right, but get as far as you can.) dy = 2ty? + 3 y² 11. dt.is a solution of. 2 x y ′ = 3 − 4 y. for any value of C which is a real number. Solution: First differentiating the function y ( x) you get. y ′ ( x) = − 2 C x 3. Then substituting it into the left side of the equation, 2 x y ′ = 2 x ( − 2 C x 3) = − 4 C x 2. Substituting into the right side of the equation gives you.Question: Use the procedures developed in this chapter to find the general solution of the differential equation.y'' − y = 2exex + e−x. Use the procedures developed in this chapter to find the general solution of the differential equation. There are 3 steps to solve this one.The complementary solution is only the solution to the homogeneous differential equation and we are after a solution to the nonhomogeneous differential equation and the initial conditions must satisfy that solution instead of the complementary solution. So, we need the general solution to the nonhomogeneous differential equation.Show that the given solution is a general solution of the differential equation. Use a computer or calculator to sketch the solutions for the given values of the arbitrary constant. Experiment with different intervals for t until you have a plot that shows what you consider to be the most important behavior of the family. y'+y=2t, y (t)=2t-2+Ce ...The Wolfram Language can find solutions to ordinary, partial and delay differential equations (ODEs, PDEs and DDEs). DSolveValue takes a differential equation and returns the general solution: (C[1] stands for a constant of integration.) Use /. to replace the constant: Or add conditions for a specific solution:In today’s digital age, our smartphones have become an essential tool for various tasks, including calculations. Whether you’re a student solving complex equations or a professiona... The Euler's Method is a straightforward numerical technique that approximates the solution of ordinary differential equations (ODE). Named after the Swiss mathematician Leonhard Euler, this method is precious for its simplicity and ease of understanding, especially for those new to differential equations. Basic Concept. Real-life examples of linear equations include distance and rate problems, pricing problems, calculating dimensions and mixing different percentages of solutions. Linear equations ...Video transcript. - [Instructor] So let's write down a differential equation, the derivative of y with respect to x is equal to four y over x. And what we'll see in this video is the solution to a differential equation isn't a value or a set of values. It's a function or a set of functions.Step-by-Step Solutions with Pro Get a step ahead with your homework Go Pro Now. differential equation. Natural Language; Math Input; Extended Keyboard Examples Upload Random. Assuming "differential equation" is a general topic | Use as a computation or referring to a mathematical definition or a calculus result or a word instead. Examples for ...Equations Inequalities Scientific Calculator Scientific Notation Arithmetics Complex Numbers Polar/Cartesian Simultaneous Equations System of Inequalities Polynomials Rationales Functions Arithmetic & Comp. Coordinate Geometry Plane Geometry Solid Geometry Conic Sections TrigonometryMolarity is an unit for expressing the concentration of a solute in a solution, and it is calculated by dividing the moles of solute by the liters of solution. Written in equation ...Critical Solutions News: This is the News-site for the company Critical Solutions on Markets Insider Indices Commodities Currencies StocksFree Method of Frobenius ODE Calculator - solve ODE using the method of Frobenius step by stepExplore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.The given differential equation is. 2 t 2 x ″ + 3 t x ′ − x = − 12 t ln t. ( t > 0) Explanation: The general solution of the given differential equation is x ( t) = x c ( t) + x p ( t) View the full answer Step 2. Unlock. Answer. Unlock.Convert the differential equation from the time domain to the s-domain using the Laplace Transform. The differential equation will be transformed into an algebraic equation, which is typically easier to solve. After solving in the s-domain, the Inverse Laplace Transform can be applied to revert the solution to the time domain.We first note that if \(y(t_0) = 25\), the right hand side of the differential equation is zero, and so the constant function \(y(t)=25\) is a solution to the differential equation. It is not a solution to the initial value problem, since \(y(0)\not=40\). (The physical interpretation of this constant solution is that if a liquid is at the same ...Find the general solution of the first order linear differential equation X' = Ax, where the coefficient matrix is 4. A= 4 4 Recall that this coefficient matrix has eigenpairs 21 = 6, Vi = 02] and 22 = 2, V2 = [-2] 2 Below Ci and C2 are arbitrary constants.Exercise 8.1.1. Verify that y = 2e3x − 2x − 2 is a solution to the differential equation y' − 3y = 6x + 4. Hint. It is convenient to define characteristics of differential equations that make it easier to talk about them and categorize them. The most basic characteristic of a differential equation is its order.Second Order Differential Equation Solver. Enter the Differential Equation: = Calculate: Computing... Get this widget. Build your own widget ...derived below for the associated case.Since the Legendre differential equation is a second-order ordinary differential equation, it has two linearly independent solutions.A solution which is regular at finite points is called a Legendre function of the first kind, while a solution which is singular at is called a Legendre function of the second kind.An ordinary differential equation ( ODE) is an equation containing an unknown function of one real or complex variable x, its derivatives, and some given functions of x. The unknown function is generally represented by a variable (often denoted y ), which, therefore, depends on x. Thus x is often called the independent variable of the equation.Here, we show you a step-by-step solved example of homogeneous differential equation. This solution was automatically generated by our smart calculator: \left (x-y\right)dx+xdy=0 (x y)dx xdy 0. We can identify that the differential equation \left (x-y\right)dx+x\cdot dy=0 (x−y)dx+x⋅dy = 0 is homogeneous, since it is written in the standard ...Some partial differential equations can be solved exactly in the Wolfram Language using DSolve[eqn, y, x1, x2], and numerically using NDSolve[eqns, y, x, xmin, xmax, t, tmin, tmax].. In general, partial differential equations are much more difficult to solve analytically than are ordinary differential equations.They may sometimes be solved using a …Differential Equations Calculator. Get detailed solutions to your math problems with our Differential Equations step-by-step calculator. Practice your math skills and learn step by step with our math solver. Check out all of our online calculators here. dy dx = sin ( 5x)Question: (a) Calculate the general solution of the differential equation (d2 x/ dt2) + (3 (dx/dt)) − 10x = 0 (b) Calculate the solution of the initial value problem: (d2 x/ dt2) + (3 (dx/dt)) − 10x = 28e2t − 8 sin (2t) + 20 cos 2t, x (0) = −1, ( (dx/dt) (0)) = −1. (a) Calculate the general solution of the differential equation (d 2 x ...Question: Find the general solution of the differential equation.y double prime minus 25 yequals0. Find the general solution of the differential equation. y double prime minus 2 5 yequals 0. Here's the best way to solve it. Powered by Chegg AI.This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: 1. Calculate a general solution of the differential equation: 2t2y′′−6ty′+8y=240t2−t540 (t>0) Start by stating the type of the equation and the method used to solve it. Try focusing on one step at a time.The general solution to the second-order differential equation 3 y ′′−9 y ′+2 y =0 is in the form y ( x )= c 1 er 1 x + c 2 er 2 x . Find the values of r 1 and r 2. There are 2 steps to solve this one. Expert-verified. 100% (3 ratings)Find a general solution to the differential equation \(y'=(x^2−4)(3y+2)\) using the method of separation of variables. Solution. ... To calculate the rate at which salt leaves the tank, we need the concentration of salt in the tank at any point in time. Since the actual amount of salt varies over time, so does the concentration of salt.First Order Differential Equations Calculator online with solution and steps. Detailed step by step solutions to your First Order Differential Equations problems with our math solver …Enter the differential equation whose direction field you want to plot using as the independent variable. You can change the plot range of the direction field with the x min, x max, y min and y max values. The add solution curve button will add a curve through an initial point. This curve is tangent to the slope field for its length.Differential Equations Calculator online with solution and steps. Detailed step by step solutions to your Differential Equations problems with our math solver and online calculator.Here's the best way to solve it. Find the most general real-valued solution to the linear system of differential equations x' = [2 -36 1 2] x. [x_1 (t) x_2 (t)] = c_1 [] + c_2 [] b. In the phase plane, this system is best described as a sink/stable node spiral source spiral sink center point/ellipses source/unstable node saddle none of these.Solve Differential Equation with Condition. In the previous solution, the constant C1 appears because no condition was specified. Solve the equation with the initial condition y(0) == 2. The dsolve function finds a value of C1 that satisfies the condition.Thus, f (x)=e^ (rx) is a general solution to any 2nd order linear homogeneous differential equation. To find the solution to a particular 2nd order linear homogeneous DEQ, we can plug in this general solution to the equation at hand to find the values of r that satisfy the given DEQ.differential equation solver. Have a question about using Wolfram|Alpha? Contact Pro Premium Expert Support ». Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. For math, science, nutrition, history, geography, engineering, mathematics, linguistics, sports, finance ...Though we need nth derivative of f to exist for all x for which the differential equation is defined, when f is a solution of nth order ordinary differential equation. The "general solution" in this particular question is chosen to be continuous for some reasons and differentiability is ignored. Here's the link-$\endgroup$ -Enter the differential equation whose direction field you want to plot using as the independent variable. You can change the plot range of the direction field with the x min, x max, y min and y max values. The add solution curve button will add a curve through an initial point. This curve is tangent to the slope field for its length.Question: 4.6.4 Find a general solution to the differential equation using the method of variation of parameters. y"+10y'+ 25y 2e -st The general solution is y () c+cte ttte -St ar Enter your answer in the answer box and then click Check Answer ro All parts showing Clear All. There are 2 steps to solve this one.This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: 1. Calculate a general solution of the differential equation: 2t2y′′−6ty′+8y=240t2−t540 (t>0) Start by stating the type of the equation and the method used to solve it. Try focusing on one step at a time.Use Math24.pro for solving differential equations of any type here and now. Our examples of problem solving will help you understand how to enter data and get the correct answer. An additional service with step-by-step solutions of differential equations is available at your service. Free ordinary differential equations (ODE) calculator - solve ordinary differential equations (ODE) step-by-stepExplore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.Step 1. The auxiliary equation of the homogenous part ... Consider the following differential equation. у" + 2y'- 63у 3 Proceed as in this example to find a particular solution y (x) of the given differential equation in the integral form y (x) = G (x, t)f (t) dt. У, (х) %3D dt Proceed as in this example to find the general solution of the ...Solving the Logistic Differential Equation. The logistic differential equation is an autonomous differential equation, so we can use separation of variables to find the general solution, as we just did in Example 8.4.1. Step 1: Setting the right-hand side equal to zero leads to P = 0 and P = K as constant solutions.A General Solution Calculator works by taking a differential equation as an input represented as y = f(x) and calculating the results of the differential equation. Solving a …Free derivative calculator - differentiate functions with all the steps. Type in any function derivative to get the solution, steps and graphThis step-by-step program has the ability to solve many types of first-order equations such as separable, linear, Bernoulli, exact, and homogeneous. In addition, it solves higher-order equations with methods like undetermined coefficients, variation of parameters, the method of Laplace transforms, and many more.Here, we show you a step-by-step solved example of first order differential equations. This solution was automatically generated by our smart calculator: Rewrite the differential equation in the standard form M (x,y)dx+N (x,y)dy=0 M (x,y)dx+N (x,y)dy = 0. The differential equation 4ydy-5x^2dx=0 4ydy−5x2dx= 0 is exact, since it is written in ...Euler's Method after the famous Leonhard Euler. Euler's Method. And not only actually is this one a good way of approximating what the solution to this or any differential equation is, but actually for this differential equation in particular you can actually even use this to find E with more and more and more precision.Let us try a power series solution near \(x_o=0\), which is an ordinary point. Solution. Every point is an ordinary point in fact, as the equation is constant coefficient. We already know we should obtain exponentials or the hyperbolic sine and cosine, but let us pretend we do not know this. We try \[ y = \sum_{k=0}^\infty a_k x^k \nonumber \]Here, we show you a step-by-step solved example of first order differential equations. This solution was automatically generated by our smart calculator: Rewrite the differential equation in the standard form M (x,y)dx+N (x,y)dy=0 M (x,y)dx+N (x,y)dy = 0. The differential equation 4ydy-5x^2dx=0 4ydy−5x2dx= 0 is exact, since it is written in ...Second Order Differential Equation. The widget will take any Non-Homogeneus Second Order Differential Equation and their initial values to display an exact solution. Get the free "Second Order Differential Equation" widget for your website, blog, Wordpress, Blogger, or iGoogle. Find more Mathematics widgets in Wolfram|Alpha.In today’s digital age, online calculators have become an essential tool for a wide range of tasks. Whether you need to calculate complex mathematical equations or simply convert c...These types of differential equations are called Euler Equations. Recall from the previous section that a point is an ordinary point if the quotients, have Taylor series around \ ( {x_0} = 0\). However, because of the \ (x\) in the denominator neither of these will have a Taylor series around \ ( {x_0} = 0\) and so \ ( {x_0} = 0\) is a singular ...You can dynamically calculate the differential equation. Online calculator is capable to solve the ordinary differential equation with separated variables, homogeneous, exact, …Solve Differential Equation with Condition. In the previous solution, the constant C1 appears because no condition was specified. Solve the equation with the initial condition y(0) == 2. The dsolve function finds a value of C1 that satisfies the condition.It is the same concept when solving differential equations - find general solution first, then substitute given numbers to find particular solutions. Let's see some examples of first order, first degree DEs. Example 4. a. Find the general solution for the differential equation `dy + 7x dx = 0` b. Find the particular solution given that `y(0)=3 ...Step 1. Solution: The given differential equation is x y ′ + 4 y = 5 x and the initial condition is y ( 2) = 6 that is the point is ( x 1, y 1) = ( 2, 6) View the full answer Step 2. Unlock. Answer.Differential Equations. Ordinary Differential Equations. The second-order ordinary differential equation x^2 (d^2y)/ (dx^2)+x (dy)/ (dx)- (x^2+n^2)y=0. (1) The solutions are the modified Bessel functions of the first and second kinds, and can be written y = a_1J_n (-ix)+a_2Y_n (-ix) (2) = c_1I_n (x)+c_2K_n (x), (3) where J_n (x) is a Bessel ...Find the general solution of the differential equation. Then, use the initial condition to find the corresponding particular solution. d y d x + 7 x y = 4 x, y ( 0) = - 4. The general solution is y =. The particular solution for y ( 0) = - 4 is y = . There are 4 steps to solve this one. Powered by Chegg AI.The solution to a linear first order differential equation is then. y(t) = ∫ μ(t)g(t)dt + c μ(t) where, μ(t) = e ∫ p ( t) dt. Now, the reality is that (9) is not as useful as it may seem. It is often easier to just run through the process that got us to (9) rather than using the formula.We need to isolate the dependent variable , we can do that by simultaneously subtracting 2x 2x from both sides of the equation. Divide both sides of the equation by 2 2. Divide both sides of the equation by y y. Cancel the fraction's common factor 2 2. Implicit Differentiation Calculator online with solution and steps.Question: Find the general solution of the given differential equation. dy/dt + 2t/1 + t2 y = 1/1 + t2 Find the general solution of the given differentialequation.Examples for. Differential Equations. A differential equation is an equation involving a function and its derivatives. It can be referred to as an ordinary differential equation (ODE) or a partial differential equation (PDE) depending on whether or not partial derivatives are involved.How to use the Annihilator Method to Solve a Differential Equation Example with y'' + 25y = 6sin(x)If you enjoyed this video please consider liking, sharing,...In other words, their second partial derivatives are equal. The general solution of the differential equation is of the form f (x,y)=C (,) y. 4. Using the test for exactness, we check that the differential equation is exact. 0=0 =. Explain this step further. 5. Integrate M (x,y) () with respect to x to get.Molarity is an unit for expressing the concentration of a solute in a solution, and it is calculated by dividing the moles of solute by the liters of solution. Written in equation ...Exercise 8.1.1. Verify that y = 2e3x − 2x − 2 is a solution to the differential equation y' − 3y = 6x + 4. Hint. It is convenient to define characteristics of differential equations that make it easier to talk about them and categorize them. The most basic characteristic of a differential equation is its order.Example \(\PageIndex{1}\) General Solution; Example \(\PageIndex{2}\): Graphical Solutions; Contributors and Attributions; We have already addressed how to solve a second order linear homogeneous differential equation with constant coefficients where the roots of the characteristic equation are real and distinct.Step-by-step solutions for differential equations: separable equations, first-order linear equations, first-order exact equations, Bernoulli equations, first-order substitutions, Chini-type equations, general first-order equations, second-order constant-coefficient linear equations, reduction of order, Euler-Cauchy equations, general second-order …Equations Inequalities Scientific Calculator Scientific Notation Arithmetics Complex Numbers Polar/Cartesian Simultaneous Equations System of Inequalities Polynomials Rationales Functions Arithmetic & Comp. Coordinate Geometry Plane Geometry Solid Geometry Conic Sections TrigonometryFree separable differential equations calculator - solve separable differential equations step-by-stepBrent Leary conducts an interview with Wilson Raj at SAS to discuss the importance of privacy for today's consumers and how it impacts your business. COVID-19 forced many of us to ...Free derivative calculator - differentiate functions with all the steps. Type in any function derivative to get the solution, steps and graphExample 2: Solve d 2 ydx 2 − y = 2x 2 − x − 3 1. Find the general solution of d 2 ydx 2 − y = 0 . The characteristic equation is: r 2 − 1 = 0. Factor: (r − 1)(r + 1) = 0. r = 1 or −1. So the general solution of the differential equation is y = Ae x +Be −x. So in this case the fundamental solutions and their derivatives are:system-of-differential-equations-calculator. x^{\prime}=\begin{pmatrix}3&-4\\1&-1\end{pmatrix}x, x(0)=\begin{pmatrix}1\\0\end{pmatrix} en. Related Symbolab blog posts. Advanced Math Solutions – Ordinary Differential Equations Calculator, Linear ODE. Ordinary differential equations can be a little tricky. In a previous post, we talked about …A separable differential equation is any differential equation that we can write in the following form. N (y) dy dx = M (x) (1) (1) N ( y) d y d x = M ( x) Note that in order for a differential equation to be separable all the y y 's in the differential equation must be multiplied by the derivative and all the x x 's in the differential ...

Find the general solution of the linear system. Then use the initial conditions to find the particular solution that satisfies them. Use a computer system or graphing calculator to construct a direction field and typical solution curves for the system. x′=7x+y;y′=−8x+y;x (0)=1y (0)=0 Eliminate y and solve the remaining differential .... California bar exam essay predictions february 2023

general solution of the differential equation calculator

This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: Find the general solution of the differential equation y" + (wo) y = cos (wt), w2 # (wo)?. NOTE: Use C1, C2, for the constants of integration. 1 y (t) = ( cos (w t) + c sin (w t) + + sin (w t) х اليه 2 1000.Step 1. 3. [-/3 Points] DETAILS Find the general solution to the differential equation. y" + 6y + 58y = 0 y (x) = Submit Answer 4. [-13 Points] DETAILS Find the general solution to the differential equation. Gd²y + 40 dy 16 dx² + 25y = 0 dx y (x) = 5. [-14 Points) DETAILS Solve the initial-value problem. 5y" + 8y' + 3y = 0 Y (0) = 8 y (0 ... Free derivative calculator - differentiate functions with all the steps. Type in any function derivative to get the solution, steps and graph The complementary solution is only the solution to the homogeneous differential equation and we are after a solution to the nonhomogeneous differential equation and the initial conditions must satisfy that solution instead of the complementary solution. So, we need the general solution to the nonhomogeneous differential equation.If we use the conditions y(0) y ( 0) and y(2π) y ( 2 π) the only way we’ll ever get a solution to the boundary value problem is if we have, y(0) = a y(2π) = a y ( 0) = a y ( 2 π) = a. for any value of a a. Also, note that if we do have these boundary conditions we’ll in fact get infinitely many solutions.A separable differential equation is any differential equation that we can write in the following form. N (y) dy dx = M (x) (1) (1) N ( y) d y d x = M ( x) Note that in order for a differential equation to be separable all the y y 's in the differential equation must be multiplied by the derivative and all the x x 's in the differential ...The Handy Calculator tool provides you the result without delay. Second Order Differential Equation is represented as d^2y/dx^2=f"' (x)=y''. Have a look at the following steps and use them while solving the second order differential equation. Take any equation with second order differential equation. Let us assume dy/dx as an variable r.A separable differential equation is a common kind of differential equation that is especially straightforward to solve. Separable equations have the form \frac {dy} {dx}=f (x)g (y) dxdy = f (x)g(y), and are called separable because the variables x x and y y can be brought to opposite sides of the equation. Then, integrating both sides gives y ... (The Wolfram Language function NDSolve, on the other hand, is a general numerical differential equation solver.) DSolve can handle the following types of equations: Finding symbolic solutions to ordinary differential equations. DSolve returns results as lists of rules. This makes it possible to return multiple solutions to an equation. Free Method of Frobenius ODE Calculator - solve ODE using the method of Frobenius step by stepLearn how to find the general solution of differential equations with this video tutorial. Discover the method of integrating factors and the role of derivatives in solving these equations.derived below for the associated case.Since the Legendre differential equation is a second-order ordinary differential equation, it has two linearly independent solutions.A solution which is regular at finite points is called a Legendre function of the first kind, while a solution which is singular at is called a Legendre function of the second kind.Step 1. Find the general solution of the given differential equation. y' + 5x4y = x4 y (x) = Give the largest interval over which the general solution is defined. (Think about the implications of any singular points. Enter your answer using interval notation.) Determine whether there are any transient terms in the general solution.If the heat flow is negative then we need to have a minus sign on the right side of the equation to make sure that it has the proper sign. If the bar is cooler than the surrounding fluid at x = 0 x = 0, i.e. u(0,t) <g1(t) u ( 0, t) < g 1 ( t) we can make a similar argument to justify the minus sign. We'll leave it to you to verify this..

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