Simplify fourth root of 81a^4

$\sqrt[4]{81 a^{4}}$

Step 1

Rewrite $81 a^{4}$ as ${(3 a)}^{4}$ .

$\sqrt[4]{{(3 a)}^{4}}$

Step 2

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

$3 a$

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