Answer
$\color{blue}{z(-9z^2+7z+1)}$
Work Step by Step
Each term has the variable $z$.
The lowest exponent of $x$ is $1$.
Thus, the GCF is $z^1$ or $z$.
Factor out $z$ to obtain:
$=z(7z-9z^2+1)
\\=\color{blue}{z(-9z^2+7z+1)}$
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