Answer
$(b-6)(a+2)$
Work Step by Step
Using factoring by grouping, then the factored form of the given expression, $
ab-6a+2b-12
,$ is
\begin{array}{l}\require{cancel}
(ab-6a)+(2b-12)
\\\\=
a(b-6)+2(b-6)
\\\\=
(b-6)(a+2)
.\end{array}
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