Answer
$$k$$
Work Step by Step
Since the matrix is triangular and it is easy to see that its determinant is
$$(1)(k)(1)=k.$$
Elementary Linear Algebra 7th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
1-13311-087-8
ISBN 13:
978-1-13311-087-3
Chapter 3 - Determinants - 3.2 Determinants and Elementary Operations - 3.2 Exercises - Page 119: 39
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