Differential Equations and Linear Algebra (4th Edition)

Published by Pearson
ISBN 10: 0-32196-467-5
ISBN 13: 978-0-32196-467-0

Chapter 2 - Matrices and Systems of Linear Equations - 2.3 Terminology for Systems of Linear Equations - Problems - Page 145: 23

Answer

$x'=Ax+b=\begin{bmatrix} 3e^t+2te^t\\ e^t+2te^t \end{bmatrix}$

Work Step by Step

$x'=\begin{bmatrix} 3e^t & 2te^t\\ e^t & 2te^t \end{bmatrix}$ $Ax+b=\begin{bmatrix} 2 & -1\\ -1 & 2 \end{bmatrix}.\begin{bmatrix} 2te^t +e^t\\ 2te^t -e^t \end{bmatrix}+\begin{bmatrix} 0\\ 4e^t \end{bmatrix}$ $=\begin{bmatrix} 4te^t + 2e^t-2te^t+e^t\\ -2te^t -e^t+4te^t-2e^t \end{bmatrix}+\begin{bmatrix} 0\\ 4e^t \end{bmatrix}$ $=\begin{bmatrix} 3e^t+2te^t\\ e^t+2te^t \end{bmatrix}$
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