Answer
$4a^{2}b^{6}$
Work Step by Step
$\sqrt {16a^{4}b^{12}}$
=$\sqrt {16}\times\sqrt {a^{4}}\times\sqrt {b^{12}}$
=$\sqrt {4^{2}}\times\sqrt {a^{4}}\times\sqrt {b^{12}}$
=$4\times a^{2}\times b^{6}$
=$4a^{2}b^{6}$
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