Answer
See explanations.
Work Step by Step
When expanding a determinant by minors:
Identify the row $i$ and column $j$ of the element from which the expansion take place; evaluate $i+j$, and if it is odd, supply a minus sign.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 8 - Section 8.5 - Determinants and Cramer's Rule - Exercise Set - Page 946: 58
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