Answer
$\{-15,15\}$
Work Step by Step
Since $(
-15
)^2=
225
$ and $
15
^2=
225
$, the square roots of $
225
$ are $
\{-15,15\}
$.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 10 - Exponents and Radicals - 10.1 Radical Expressions and Functions - 10.1 Exercise Set - Page 634: 16
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