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: 15

Answer

$\begin{bmatrix} 28 & -9\\ 4 & 23 \end{bmatrix}$

Work Step by Step

$\begin{bmatrix} 0&3&-5\\ 1&2&6 \end{bmatrix}\times\begin{bmatrix} 4&1\\ 6&2\\ -2&3 \end{bmatrix}:$ Let M be the resultant matrix. $\implies M_{1,1} = (0)(4)+(3)(6)+(-5)(-2) = 28$ $\implies M_{1,2} = (0)(1)+(3)(2)+(-5)(3) = -9$ $\implies M_{2,1} = (1)(4)+(2)(6)+(6)(-2) = 4$ $\implies M_{2,2} = (1)(1)+(2)(2)+(6)(3) = 23$ $\therefore M = \begin{bmatrix} 28 & -9\\ 4 & 23 \end{bmatrix}$
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