Answer
See below.
Work Step by Step
The error is that since we are taking an even root, the negative value is also possible, thus $\sqrt[4]{81}=\pm3$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 6 Rational Exponents and Radical Functions - 6.1 Evaluate nth Roots and Use Rational Exponents - 6.1 Exercises - Skill Practice - Page 418: 49
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