Simplify - fourth root of 81

$- \sqrt[4]{81}$

Step 1

Rewrite $81$ as $3^{4}$ .

$- \sqrt[4]{3^{4}}$

Step 2

Pull terms out from under the radical, assuming positive real numbers.

$- 1 \cdot 3$

Step 3

Multiply $- 1$ by $3$ .

$- 3$

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