Answer
$3pq(1+2p+3q)$
Work Step by Step
$3pq + 6p^2q+9pq^2$
$=3pq + 3pq(2p)+3pq(3q)$
Factor $3pq$ out of $3pq + 6p^2q+9pq^2$
$\rightarrow 3pq(1+2p+3q)$
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