Answer
$3$
Work Step by Step
When a number is raised to the fourth power, the fourth root cancels out the exponent. We use this rule to simplify: $$\sqrt[4] {81}=\sqrt[4] {3\times3\times3\times3}=\sqrt[4] {3^4}=3$$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 11 - Additional Topics - 11.3 - Fractional Exponents - Problem Set 11.3 - Page 489: 11
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