Answer
$\sqrt[4]{54}$
Work Step by Step
Using $\sqrt[a]{x}\sqrt[a]{y}=\sqrt[a]{xy}$, the given expression, $
\sqrt[4]{6}\sqrt[4]{9}
,$ simplifies to
\begin{array}{l}\require{cancel}
\sqrt[4]{6(9)}
\\\\=
\sqrt[4]{54}
.\end{array}
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