Hello, emetty90!

Find the focus of the parabola: .

We must get the equation into the form: .

Then the vertex is at and is the directed distance from the vertex to the focus.

We have: .

Divide by 3: .

Complete the square: .

. . And we have: .

The vertex is: . . . . and the parabola opens downward.

Since . . . The focus is unitthe vertex.below

Therefore, the focus is: .