## Intermediate Algebra (6th Edition)

Published by Pearson

# Appendix C - C - Exercise Set: 2

19

#### Work Step by Step

A 2x2 determinant can be calculated as $ad-bc$, where a is the upper-left entry, b is the upper-right entry, c is the lower-left entry, and d is the lower-right entry. Therefore, the value of the determinant is $(-5\times-4)-(1\times1)=20-1=19$

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