Answer
$(a+b)(c+1)$
Work Step by Step
Using factoring by grouping, the factored form of the given expression, $
ac+bc+a+b
,$ is
\begin{array}{l}\require{cancel}
(ac+bc)+(a+b)
\\\\=
c(a+b)+(a+b)
\\\\=
(a+b)(c+1)
.\end{array}
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