(y-2)^2=4(x+3)

i got the vertex--(2,-3)

but am having trouble finding the focus and directrix.

i know the x coordinate of the focus is -2, but i'm not sure how to find the y coordinate. my teacher told us to take the number out in front on the right, in this case 4, and divide by 4. so, the answer is 1. but the answer in the back of the book is (-2,2). do i just add one to 4/4? if so, do i always?

thanks in advance.