Answer
$16$.
Work Step by Step
The area of the triangle is given by
$$\pm\frac{1}{2}
\left|\begin{array}{rrr}{1} & {0} & {1} \\ {5} & {0} & {1} \\ {5} & {8} & {1}\end{array}\right|=\pm\frac{1}{2} (8)(1-5)=16.
$$
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 - Review Exercises - Page 140: 65
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