Answer
$7a^2b^5(a-6b)$
Work Step by Step
Factoring the $GCF=
7a^2b^5
,$ the given expression, $
7a^3b^5-42a^2b^6
,$ is equivalent to
\begin{array}{l}\require{cancel}
7a^2b^5(a-6b)
.\end{array}
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