Answer
$3x^{2}$
Work Step by Step
$(9x^{4})^{\frac{1}{2}}=\sqrt (9x^{4})=3x^{2}$
We know this because $(3x^{2})^{2}=3x^{2}\times3x^{2}=(3\times3)\times x^{2+2}=9x^{4}$
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