Simplify square root of 81x^4y^2

$\sqrt{81 x^{4} y^{2}}$

Step 1

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

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

Step 2

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

$9 x^{2} y$

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