# How do you factor 3pih+3pih^2 completely?

$3 \pi h \left(1 + h\right)$
There is a $\textcolor{b l u e}{\text{common factor}}$ of $3 \pi h$ in both terms, which can be taken out.
$\Rightarrow 3 \pi h + 3 \pi {h}^{2} = 3 \pi h \left(1 + h\right)$