Solve the following ODE t y" – (1+t)y' + y = t² e' where one complementary solution is y1 = 1+t. %3D

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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I got y2 =et, W=tet, W1=-et, and W2=1+t

For my final answer I got c1(1+t)+c2et+et(1-t2/2 + t3/3).  

I'm not sure if it is right, but I can't find what, if anything I did wrong.

### Differential Equations: Solving ODEs

**Problem Statement:**

Solve the following ordinary differential equation (ODE):

\[ 
t y'' - (1 + t)y' + y = t^2 e^t 
\]

where one complementary solution is \( y_1 = 1 + t \).

**Hint:** You may need to use Abel's theorem.

**Detailed Explanation:**

In this problem, you are given a second-order linear differential equation:

\[ 
t y'' - (1 + t)y' + y = t^2 e^t 
\]

and one complementary (particular) solution \( y_1 = 1 + t \).

### Steps to Solve:

1. **Substitute the given complementary solution** into the homogeneous part of the differential equation to verify it.
2. **Apply Abel's Theorem** if necessary to find the second linearly independent solution.
3. **Find the particular integral** of the differential equation using methods such as undetermined coefficients or variation of parameters.
4. **Combine the complementary solution and the particular integral** to form the general solution.

This problem provides a hint that Abel's theorem might be helpful. Abel's theorem is useful for solving linear differential equations and finding the Wronskian of the solutions.

For a detailed step-by-step solution, please refer to the relevant sections of your differential equations textbook or consult with your instructor.

**Keywords:** Ordinary Differential Equation, Complementary Solution, Abel's Theorem, Wronskian, Particular Integral.
Transcribed Image Text:### Differential Equations: Solving ODEs **Problem Statement:** Solve the following ordinary differential equation (ODE): \[ t y'' - (1 + t)y' + y = t^2 e^t \] where one complementary solution is \( y_1 = 1 + t \). **Hint:** You may need to use Abel's theorem. **Detailed Explanation:** In this problem, you are given a second-order linear differential equation: \[ t y'' - (1 + t)y' + y = t^2 e^t \] and one complementary (particular) solution \( y_1 = 1 + t \). ### Steps to Solve: 1. **Substitute the given complementary solution** into the homogeneous part of the differential equation to verify it. 2. **Apply Abel's Theorem** if necessary to find the second linearly independent solution. 3. **Find the particular integral** of the differential equation using methods such as undetermined coefficients or variation of parameters. 4. **Combine the complementary solution and the particular integral** to form the general solution. This problem provides a hint that Abel's theorem might be helpful. Abel's theorem is useful for solving linear differential equations and finding the Wronskian of the solutions. For a detailed step-by-step solution, please refer to the relevant sections of your differential equations textbook or consult with your instructor. **Keywords:** Ordinary Differential Equation, Complementary Solution, Abel's Theorem, Wronskian, Particular Integral.
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