I have the equation: (y - 2)^2 = -8(x - 3)

I learned that the focus is the "-8" part which is the distance from the vertex, and the vertex from the equation is (3,2) and this parabola is opening up sideways to the left. So from (3,2), the focus would be 8 units into the left direction which would be at (-5,2) but apparently this is wrong.

How else would I find the focus?