Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 3 Linear Systems and Matrices - 3.6 Multiplying Matrices - 3.6 Exercises - Skill Practice - Page 200: 23

Answer

$-\frac{1}{2}AC=\begin{bmatrix} 21 & -6 \\ -14 & 1 \end{bmatrix}$

Work Step by Step

$-\frac{1}{2}AC=-\frac{1}{2}\begin{bmatrix} 5 & -3 \\ -2 & 4 \end{bmatrix} \times \begin{bmatrix} -6 & 3 \\ 4 & 1 \end{bmatrix}$ $=-\frac{1}{2}\begin{bmatrix} (5\times(-6))+(-3\times4) & (5\times3)+(-3\times1) \\ (-2\times(-6))+(4\times4) & (-2\times3)+(4\times1) \end{bmatrix}$ $=\begin{bmatrix} -\frac{1}{2}\times(-42) & -\frac{1}{2}\times12 \\ -\frac{1}{2}\times28 & -\frac{1}{2}\times(-2) \end{bmatrix}$ $=\begin{bmatrix} 21 & -6 \\ -14 & 1 \end{bmatrix}$
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