Hello, bobby77!

The focus of the parabola:

We must the equation into "standard form".

. . .

Divide by 4: .

Complete the square: .

and we have: .

Factor: .. . . standard form!

This parabola opens to the left:

Its vertex is:

Since , we have:

The focus is units to theleftof the vertex.

Therefore, the focus is: .