Solve the given system of differential equations by systematic elimination. d²x dt² d²y = 16x - et dt² = 16y + et
Solve the given system of differential equations by systematic elimination. d²x dt² d²y = 16x - et dt² = 16y + et
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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![### Solving Systems of Differential Equations by Systematic Elimination
The goal is to solve the given system of differential equations by systematic elimination. The system is:
\[
\frac{d^2 x}{dt^2} = 16 y + e^t
\]
\[
\frac{d^2 y}{dt^2} = 16 x - e^t
\]
To find the solutions \( x(t) \) and \( y(t) \), we can proceed as follows:
1. Define the general solution structure for both \( x(t) \) and \( y(t) \) by combining terms that arise from solving the homogeneous parts of each differential equation and particular solutions that address the non-homogeneous parts (i.e., terms involving \( e^t \)).
2. Apply systematic elimination techniques to decouple the equations where possible.
The solutions are then given in the following closed form:
\[
(x(t), y(t)) = \left( C_1 e^{-4t} + C_2 e^{4t} + C_1 \cos(4t) + C_2 \sin(4t), \, C_1 e^{-4t} + C_2 e^{4t} - C_1 \cos(4t) - C_2 \sin(4t) + \frac{e^t}{17} \right)
\]
Here:
- \( C_1 \) and \( C_2 \) are constants determined by initial conditions.
- The solution incorporates exponential and trigonometric functions indicating characteristic roots.
- The term \(\frac{e^t}{17}\) is a particular solution addressing the non-homogeneous part of the system.
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Transcribed Image Text:### Solving Systems of Differential Equations by Systematic Elimination
The goal is to solve the given system of differential equations by systematic elimination. The system is:
\[
\frac{d^2 x}{dt^2} = 16 y + e^t
\]
\[
\frac{d^2 y}{dt^2} = 16 x - e^t
\]
To find the solutions \( x(t) \) and \( y(t) \), we can proceed as follows:
1. Define the general solution structure for both \( x(t) \) and \( y(t) \) by combining terms that arise from solving the homogeneous parts of each differential equation and particular solutions that address the non-homogeneous parts (i.e., terms involving \( e^t \)).
2. Apply systematic elimination techniques to decouple the equations where possible.
The solutions are then given in the following closed form:
\[
(x(t), y(t)) = \left( C_1 e^{-4t} + C_2 e^{4t} + C_1 \cos(4t) + C_2 \sin(4t), \, C_1 e^{-4t} + C_2 e^{4t} - C_1 \cos(4t) - C_2 \sin(4t) + \frac{e^t}{17} \right)
\]
Here:
- \( C_1 \) and \( C_2 \) are constants determined by initial conditions.
- The solution incorporates exponential and trigonometric functions indicating characteristic roots.
- The term \(\frac{e^t}{17}\) is a particular solution addressing the non-homogeneous part of the system.
**Need Help?** Click [Read It] for an interactive guide and detailed step-by-step breakdown.

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