Answer
$[-6,1]$
See graph.
Work Step by Step
Step 1. $2u+5|\le7$ can be separated into $-7\le 2u+5\le 7 \longrightarrow -12\le 2u\le 2 \longrightarrow-6\le u\le1$, thus we have the solution $[-6,1]$
Step 2. See graph.
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 182: 50
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