Answer
$=\pm3$.
Work Step by Step
The given values are
$n=4$ and $a=81$
The index $n=4$ is even and $a>0$. So, $81$ has two real fourth roots.
$=\pm\sqrt[4]{81}$
Use $81=3^4$.
$=\pm\sqrt[4]{3^4}$
Simplify.
$=\pm3$.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 6 - Exponential Functions and Sequences - 6.2 - Radicals and Rational Exponents - Exercises - Page 303: 8
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