Answer
$7$
Work Step by Step
To derive this matrix from the original matrix, we add $3$ times row 3 to row 2. Hence, by Theorem 3(a), the determinant of the new matrix and the determinant of the original matrix are equal.
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: 20
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