Since $-3$ is a zero of $f(x)$, it means that $(x - (-3))$, or $(x+3)$, is a factor of $f(x)$.
We can use polynomial long division or synthetic division to divide $f(x)$ by $(x+3)$.
Using synthetic division:
The zero is $-3$. The coefficients of $f(x)$ are $4,
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