Answer
$a^{14}b^{7}$
Work Step by Step
Using $(ab)^x=a^xb^x$, then the expression, $
(a^2b)^{7}
$, simplifies to
\begin{array}{l}\require{cancel}
a^{2(7)}b^{7}
\\\\=
a^{14}b^{7}
.\end{array}
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