Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 11 - Systems of Equations and Inequalities - 11.4 Matrix Algebra - 11.4 Assess Your Understanding - Page 758: 16

Answer

$\begin{bmatrix} 22&6\\ 14&-2 \end{bmatrix}$

Work Step by Step

$\begin{bmatrix} 4&1&0\\ -2&3&-2 \end{bmatrix}\times\begin{bmatrix} 4&1\\ 6&2\\ -2&3 \end{bmatrix}:$ Let the resultant be matrix M. $\implies M_{1,1} = (4)(4)+(1)(6)+(0)(-2) = 22$ $\implies M_{1,2} = (4)(1)+(1)(2)+(0)(3) = 6$ $\implies M_{2,1} = (-2)(4)+(3)(6)+(-2)(-2) = 14$ $\implies M_{2,2} = (-2)(1)+(3)(2)+(-2)(3) = -2$ $\therefore M = \begin{bmatrix} 22&6\\ 14&-2 \end{bmatrix}$
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