Simplify square root of 81x^4

$\sqrt{81 x^{4}}$

Step 1

Rewrite $81 x^{4}$ as ${(9 x^{2})}^{2}$ .

$\sqrt{{(9 x^{2})}^{2}}$

Step 2

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

$9 x^{2}$

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