Answer
$-9$
Work Step by Step
Extracting the factor that is a perfect power of the index, then
\begin{array}{l}\require{cancel}
-\sqrt{81}
\\\\=
-\sqrt{9^2}
\\\\=
-9
.\end{array}
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 - Study Summary - Practice Exercises - Page 690: 1
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