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Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
Question
Solve the given Differential Equation by variation of parameters.
The equation shown is a second-order linear differential equation:

\[ y'' - 2y' + y = \frac{e^x}{1 + x^2} \]

### Explanation:

- **\( y'' \)**: This term represents the second derivative of \( y \) with respect to \( x \), indicating how the rate of change of the rate of change of \( y \) is affected.
  
- **\(- 2y'\)**: This is the first derivative of \( y \) multiplied by -2, which implies a damping or reducing effect on the system described by this equation.
  
- **\( + y \)**: This term keeps the function \( y \) itself in the equation, acting as feedback in the system.

- **\[ = \frac{e^x}{1 + x^2} \]**: The right-hand side of the equation is a function of \( x \). Here, \( e^x \) is the exponential function, while \( 1 + x^2 \) is the denominator, suggesting the equation has a response to an exponential input that is moderated by a polynomial factor.

This equation may be used in contexts such as physics or engineering to model complex systems where change occurs over time. Solving it typically involves finding a particular solution to the inhomogeneous equation alongside the general solution of the corresponding homogeneous equation.
Transcribed Image Text:The equation shown is a second-order linear differential equation: \[ y'' - 2y' + y = \frac{e^x}{1 + x^2} \] ### Explanation: - **\( y'' \)**: This term represents the second derivative of \( y \) with respect to \( x \), indicating how the rate of change of the rate of change of \( y \) is affected. - **\(- 2y'\)**: This is the first derivative of \( y \) multiplied by -2, which implies a damping or reducing effect on the system described by this equation. - **\( + y \)**: This term keeps the function \( y \) itself in the equation, acting as feedback in the system. - **\[ = \frac{e^x}{1 + x^2} \]**: The right-hand side of the equation is a function of \( x \). Here, \( e^x \) is the exponential function, while \( 1 + x^2 \) is the denominator, suggesting the equation has a response to an exponential input that is moderated by a polynomial factor. This equation may be used in contexts such as physics or engineering to model complex systems where change occurs over time. Solving it typically involves finding a particular solution to the inhomogeneous equation alongside the general solution of the corresponding homogeneous equation.
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