Finding the focus of a parabola

[TheNascar92]

I have a parabolic function of:

x=-1/8y^2

i found the focus to be -2,0 and the directrix to be 2,0. Is this correct?

 

[Deleted member 4993]

I have a parabolic function of:

x=-1/8y^2

i found the focus to be -2,0 and the directrix to be 2,0. Is this correct?

What equations did you use to find those?