## Elementary Algebra

Published by Cengage Learning

# Chapter 11 - Additional Topics - 11.3 - Fractional Exponents - Problem Set 11.3: 11

#### 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: $$\sqrt[4] {81}=\sqrt[4] {3\times3\times3\times3}=\sqrt[4] {3^4}=3$$

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