Answer
$u=a$ or $u=-a$.
Work Step by Step
$|u|=a$ is equivalent to $u=a$ or $u=-a$.
For example, $|x|=1$ implies that $x=1$ or $x=-1$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 2 - Linear and Quadratic Functions - Section 2.8 Equations and Inequalities Involving the Absolute Value Function - 2.8 Assess Your Understanding - Page 181: 7
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