Answer
Factor $2$ out of the first column.
Work Step by Step
$$
\left|\begin{array}{ll}{4} & {1} \\ {2} & {8}\end{array}\right|=2\left|\begin{array}{ll}{2} & {1} \\ {1} & {8}\end{array}\right|.
$$
Factor $2$ out of the first column.
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 118: 8
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