Answer
$3y^2z^3$
Work Step by Step
\begin{align*}
\text{The $GCF$ of $
12,
9,
\text{ and }
15
\text{ is }
3
$}
.\\\\
\text{The $GCF$ of $
y^2,
y^3,
\text{ and }
y^2
\text{ is }
y^2
$}
.\\\\
\text{The $GCF$ of $
z^4,
z^4,
\text{ and }
z^3
\text{ is }
z^3
$}
.\end{align*}
Hence, the $GCF$ of the given expressions is $3y^2z^3$.
