Answer
$-58$
Work Step by Step
Determinant formula:
$$determinant=\begin{vmatrix}
a & b \\
c & d
\end{vmatrix}=ad-bc$$
For the given:
$$\begin{vmatrix}
6& 8 \\
2 & -7
\end{vmatrix}=6(-7)-2(8)=-42-16=-58$$
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter 5 - Test - Page 581: 10
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