Answer
$35$
Work Step by Step
The second row of this matrix is $5$ times the second row of the original matrix, with all other rows unchanged. Hence, by Theorem 3(c), the determinant is $5\cdot 7=35$.
Linear Algebra and Its Applications (5th Edition)
by Lay, David C.; Lay, Steven R.; McDonald, Judi J.
Published by
Pearson
ISBN 10:
032198238X
ISBN 13:
978-0-32198-238-4
Chapter 3 - Determinants - 3.2 Exercises - Page 177: 16
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