Find the general solution of y" + 10y + 25y = e-5x using method of undetermined coefficients.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Using Method of undetermined coefficient

**Problem Statement:**

Find the general solution of the differential equation:

\[ y'' + 10y' + 25y = e^{-5x} \]

using the method of undetermined coefficients.

**Explanation:**

This problem involves solving a second-order linear non-homogeneous differential equation using the method of undetermined coefficients. The given equation is:

1. \( y'' \) represents the second derivative of \( y \) with respect to \( x \).
2. \( 10y' \) represents ten times the first derivative of \( y \).
3. \( 25y \) is twenty-five times the function \( y \).
4. The non-homogeneous part of the equation is \( e^{-5x} \), an exponential function.

The method of undetermined coefficients is a technique used to determine the particular solution of a non-homogeneous linear differential equation.

**Steps to Solve:**

1. **Find the Complementary Solution ( \( y_c \) ):**
   - Solve the homogeneous equation \( y'' + 10y' + 25y = 0 \).

2. **Determine the Particular Solution ( \( y_p \) ):**
   - Assume a form for \( y_p \) based on the non-homogeneous term \( e^{-5x} \).
   - Substitute the assumed \( y_p \) into the original equation and solve for the coefficients.

3. **General Solution:**
   - The general solution \( y \) is the sum of the complementary and particular solutions:
   \[ y = y_c + y_p \]

This topic is essential in understanding how to deal with non-homogeneous linear differential equations in mathematical and engineering problems.
Transcribed Image Text:**Problem Statement:** Find the general solution of the differential equation: \[ y'' + 10y' + 25y = e^{-5x} \] using the method of undetermined coefficients. **Explanation:** This problem involves solving a second-order linear non-homogeneous differential equation using the method of undetermined coefficients. The given equation is: 1. \( y'' \) represents the second derivative of \( y \) with respect to \( x \). 2. \( 10y' \) represents ten times the first derivative of \( y \). 3. \( 25y \) is twenty-five times the function \( y \). 4. The non-homogeneous part of the equation is \( e^{-5x} \), an exponential function. The method of undetermined coefficients is a technique used to determine the particular solution of a non-homogeneous linear differential equation. **Steps to Solve:** 1. **Find the Complementary Solution ( \( y_c \) ):** - Solve the homogeneous equation \( y'' + 10y' + 25y = 0 \). 2. **Determine the Particular Solution ( \( y_p \) ):** - Assume a form for \( y_p \) based on the non-homogeneous term \( e^{-5x} \). - Substitute the assumed \( y_p \) into the original equation and solve for the coefficients. 3. **General Solution:** - The general solution \( y \) is the sum of the complementary and particular solutions: \[ y = y_c + y_p \] This topic is essential in understanding how to deal with non-homogeneous linear differential equations in mathematical and engineering problems.
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