5 solve dx dt = [72X -27 @=132 [3] with X(6)

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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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**Title: Solving a System of Differential Equations**

**Problem Statement:**

Solve the differential equation given by:

\[ \frac{dx}{dt} = \begin{bmatrix} 7 & 2 \\ -2 & 7 \end{bmatrix} x \]

with the initial condition:

\[ x(0) = \begin{bmatrix} 3 \\ 7 \end{bmatrix} \]

**Explanation:**

This problem involves solving a system of first-order linear differential equations represented in matrix form. 

1. **Understanding the Matrix Differential Equation:**

   The given equation can be expanded as:

   \[
   \frac{d}{dt} \begin{bmatrix} x_1 \\ x_2 \end{bmatrix} = \begin{bmatrix} 7 & 2 \\ -2 & 7 \end{bmatrix} \begin{bmatrix} x_1 \\ x_2 \end{bmatrix}
   \]

   which represents a system of two coupled first-order differential equations. 

2. **Initial Conditions:**

   The initial condition is provided as:

   \[
   x(0) = \begin{bmatrix} 3 \\ 7 \end{bmatrix}
   \]

   This means that at time \( t = 0 \), the values of \( x_1 \) and \( x_2 \) are 3 and 7, respectively.

To solve this system, we typically use methods involving eigenvalues and eigenvectors of the coefficient matrix, or apply matrix exponentiation techniques.

**Graphical/Diagram Explanation:**

No graphs or diagrams accompany this problem. The problem purely involves algebraic manipulation and solution of a matrix differential equation. 

**Educational Objective:**

By solving this problem, students will learn how to:
- Set up and interpret systems of differential equations in matrix form.
- Apply initial conditions to solve for specific solutions.
- Understand the methodology of solving coupled first-order linear differential equations using matrix algebra tools such as eigenvalues and eigenvectors.

The solution of such a problem also underpins crucial concepts in disciplines like control systems, dynamics, and other areas of applied mathematics and engineering.
Transcribed Image Text:**Title: Solving a System of Differential Equations** **Problem Statement:** Solve the differential equation given by: \[ \frac{dx}{dt} = \begin{bmatrix} 7 & 2 \\ -2 & 7 \end{bmatrix} x \] with the initial condition: \[ x(0) = \begin{bmatrix} 3 \\ 7 \end{bmatrix} \] **Explanation:** This problem involves solving a system of first-order linear differential equations represented in matrix form. 1. **Understanding the Matrix Differential Equation:** The given equation can be expanded as: \[ \frac{d}{dt} \begin{bmatrix} x_1 \\ x_2 \end{bmatrix} = \begin{bmatrix} 7 & 2 \\ -2 & 7 \end{bmatrix} \begin{bmatrix} x_1 \\ x_2 \end{bmatrix} \] which represents a system of two coupled first-order differential equations. 2. **Initial Conditions:** The initial condition is provided as: \[ x(0) = \begin{bmatrix} 3 \\ 7 \end{bmatrix} \] This means that at time \( t = 0 \), the values of \( x_1 \) and \( x_2 \) are 3 and 7, respectively. To solve this system, we typically use methods involving eigenvalues and eigenvectors of the coefficient matrix, or apply matrix exponentiation techniques. **Graphical/Diagram Explanation:** No graphs or diagrams accompany this problem. The problem purely involves algebraic manipulation and solution of a matrix differential equation. **Educational Objective:** By solving this problem, students will learn how to: - Set up and interpret systems of differential equations in matrix form. - Apply initial conditions to solve for specific solutions. - Understand the methodology of solving coupled first-order linear differential equations using matrix algebra tools such as eigenvalues and eigenvectors. The solution of such a problem also underpins crucial concepts in disciplines like control systems, dynamics, and other areas of applied mathematics and engineering.
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