## Precalculus (6th Edition) Blitzer

See figure: vertex $(0,2)$, focus $(-4,2)$, and directrix $x=4$
Step 1. From the given equation, we can find $p=\frac{-16}{4}=-4$ with the parabola opening to the left as shown in the figure. Step 2. We can identify the vertex at $(0,2)$, focus at $(-4,2)$, and directrix as $x=4$