Linear Algebra and Its Applications (5th Edition)

Published by Pearson
ISBN 10: 032198238X
ISBN 13: 978-0-32198-238-4

Chapter 3 - Determinants - 3.2 Exercises - Page 177: 17

Answer

$7$

Work Step by Step

The first row of this matrix equals the sum of the first two rows of the original matrix, with all other rows unchanged. Hence, by Theorem 3(a), the determinant does not change.
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