Answer
$w=\{ -7,7 \}$
Work Step by Step
The absolute value of a number is the distance of the number from $0$. Hence, the numbers, $w$, whose absolute value is $7$ are
\begin{array}{l}\require{cancel}
w=\{ -7,7 \}
.\end{array}
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
Published by
Pearson
ISBN 10:
0321969359
ISBN 13:
978-0-32196-935-4
Chapter R - Section R.1 - Basic Concepts - R.1 Exercises - Page 10: 12
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