Algebra 2 (1st Edition)

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



Work Step by Step

Using Cramer's rule to find the determinant of the matrices, we find: $$\det \begin{pmatrix}-4&2\\ 5&8\end{pmatrix} \\ \left(-4\right)\cdot \:8-2\cdot \:5 \\ -42$$
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