Simplify x^3 square root of y^4

$x^{3} \sqrt{y^{4}}$

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

$x^{3} \sqrt{{(y^{2})}^{2}}$

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

$x^{3} y^{2}$

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