Answer
$$
r=\frac{-12}{5+6 \cos \theta}.
$$
Work Step by Step
Since $e=1.2$ and $d=-2$, then the polar equation in the standard form is
$$
r=\frac{e d}{1+e \cos \theta}=\frac{-2.4}{1+1.2 \cos \theta}=-\frac{24}{10+12 \cos \theta}.
$$
Which simplifies to
$$r=\frac{-12}{5+6 \cos \theta}.$$
