Exercise 3. (General Solution)Consider the system i = 4x – y, ÿ = 2x + y a) Write the system in matrix form, find the corresponding characteristic polynomial, and solve for the eigenvalues and eigenvectors. b) Find the general solution of the system of differential equations, c) Classify the fixed point at the origin. d) Solve the system with the initial condition xo 3 and yo = 4.

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Chapter2: Second-order Linear Odes
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Exercise 3.
(General Solution)Consider the system i = 4x – y, ÿ = 2x + y
a) Write the system in matrix form, find the corresponding characteristic polynomial,
and solve for the eigenvalues and eigenvectors.
b) Find the general solution of the system of differential equations,
c) Classify the fixed point at the origin.
d) Solve the system with the initial condition xo = 3 and yo = 4.
Transcribed Image Text:Exercise 3. (General Solution)Consider the system i = 4x – y, ÿ = 2x + y a) Write the system in matrix form, find the corresponding characteristic polynomial, and solve for the eigenvalues and eigenvectors. b) Find the general solution of the system of differential equations, c) Classify the fixed point at the origin. d) Solve the system with the initial condition xo = 3 and yo = 4.
Expert Solution
Step 1

Given system is 

dxdt=4x-ydydt=2x+y                   (i)

In matrix form, system (i) can be written as 

x'=Ax                        (ii)

Where 

x'=x.y. , A=4-121 , x=xy

In order to find eigenvalues and eigenvectors, let us solve corresponding characteristic equation of matrix A

A-kI=04-k-121-k=0k2-5k+6=0k=2,3

For k=3

4-k-121-k=1-120~1-100

On solving the matrix equation 1-100uv=00, taking u=t gives v=t. So, eigenvector corresponding to the eigenvalue k=3 is 11

For k=2, corresponding eigenvector is 121

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