Apply the method of reduction of order (not itť's formula) to find the second solution if 6y"+ y'-y = 0 y, = e3

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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**Problem Statement:**

Apply the method of reduction of order (not its formula) to find the second solution for the differential equation:

\[ 6y'' + y' - y = 0 \]

given that one solution is 

\[ y_1 = e^{\frac{x}{3}} \] 

**Explanation:**

The task is to find a second linearly independent solution to the given second-order homogeneous linear differential equation using the method of reduction of order. This method involves assuming a solution of a specific form and using known solutions to reduce the order of the differential equation, making it easier to solve.

**Steps to Solve:**

1. Start with the known solution \( y_1 = e^{\frac{x}{3}} \).

2. To find a second solution \( y_2 \), assume \( y_2 = v(x) y_1 \), where \( v(x) \) is a function to be determined.

3. Substitute \( y_2 \) into the original differential equation to derive an equation for \( v(x) \).

4. Solve the resulting first-order differential equation to find the function \( v(x) \).

5. Multiply \( v(x) \) by \( y_1 \) to find the second solution \( y_2 \).

The process typically involves integration and algebraic manipulation, usually resulting in an expression that provides the general solution to the differential equation.
Transcribed Image Text:**Problem Statement:** Apply the method of reduction of order (not its formula) to find the second solution for the differential equation: \[ 6y'' + y' - y = 0 \] given that one solution is \[ y_1 = e^{\frac{x}{3}} \] **Explanation:** The task is to find a second linearly independent solution to the given second-order homogeneous linear differential equation using the method of reduction of order. This method involves assuming a solution of a specific form and using known solutions to reduce the order of the differential equation, making it easier to solve. **Steps to Solve:** 1. Start with the known solution \( y_1 = e^{\frac{x}{3}} \). 2. To find a second solution \( y_2 \), assume \( y_2 = v(x) y_1 \), where \( v(x) \) is a function to be determined. 3. Substitute \( y_2 \) into the original differential equation to derive an equation for \( v(x) \). 4. Solve the resulting first-order differential equation to find the function \( v(x) \). 5. Multiply \( v(x) \) by \( y_1 \) to find the second solution \( y_2 \). The process typically involves integration and algebraic manipulation, usually resulting in an expression that provides the general solution to the differential equation.
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