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 - 2.6 The Inverse of a Square Matrix - Problems - Page 178: 24

Answer

See below

Work Step by Step

Given: $x_2-2ix_2=2\\ (2-i)x_1+4ix_2=-i$ We form: $\begin{bmatrix} 1& -2i \\2-i & 4i \end{bmatrix} \begin{bmatrix}x_1 \\x_2 \end{bmatrix} \begin{bmatrix} 2\\-i \end{bmatrix}\\ \rightarrow \begin{bmatrix}x_1 \\x_2 \end{bmatrix} =\begin{bmatrix} 1 & -2i\\2-i &4i \end{bmatrix}^{-1} \begin{bmatrix} 2\\-i \end{bmatrix} \\ \rightarrow \begin{bmatrix} 1 & -2i\\2-i &4i \end{bmatrix}^{-1}= \begin{bmatrix} \frac{8}{17}+\frac{2i}{17} & \frac{4}{17}+\frac{i}{17}\\ \frac{1}{17}+\frac{9i}{34} & \frac{1}{34}-\frac{2i}{17} \end{bmatrix}\\=\frac{1}{34} \begin{bmatrix} 16+4i &2i+8\\9i+2 & 1-4i \end{bmatrix}$ Hence, $x_1=1\\x_2=\frac{i}{2}$
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