Simplify 4 square root of 81

$4 \sqrt{81}$

Step 1

Rewrite $81$ as $9^{2}$ .

$4 \sqrt{9^{2}}$

Step 2

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

$4 \cdot 9$

Step 3

Multiply $4$ by $9$ .

$36$

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