Answer
{$-3,4$}
Work Step by Step
Given: $3|2x-1|=21$
This can also be written as: $|2x-1|=7$
As per definition of absolute value, we have
$2x-1=7$ and $2x-1=-7$
Thus, $2x=8 \implies x=4$ and $2x=-6 \implies x=-3$
Hence, {$-3,4$}
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 4 - Section 4.3 - Equations and Inequalities Involving Absolute Value - Exercise Set - Page 283: 15
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