Answer
-42
Work Step by Step
Using Cramer's rule to find the determinant of the matrices, we find:
$$\det \begin{pmatrix}-4&2\\ 5&8\end{pmatrix} \\ \left(-4\right)\cdot \:8-2\cdot \:5 \\ -42$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 3 Linear Systems and Matrices - Chapter Review - Page 226: 29
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