Answer:

Explanation:
We start with the standard form of a parabola which is

We know h and k from the vertex, we just need to solve for p and then simplify the equation. P, by definition, is the distance between the directrix and the vertex. That is 3 units. So p = 3. Fitting that into our equation along with h and k gives us:

Divide both sides by 12, then add the 2 to both sides and we have our parabola!