Find the focus and directrix of the parabola

[louie3006]

Homework Statement

find the focus and directrix of the parabola:
(y+2)^2 = 16(x-1)

Homework Equations

(y-k)^2= 4a(x-h)
focus: ( h+a,k)
vertex: (h,k)

The Attempt at a Solution

k=-2,h=1,a=16/4=4!,
vertex at (1,-2)
focus ( 5,-2)
does that mean that i solved the problem or do i still to do more work to reach the final answer? thanks in advance.

 

[mutton]

Well, did you find the focus and directrix?

 

[louie3006]

i think i did , don't you think so ?

 

[mutton]

The directrix is a line. You don't have any line equations in your answer.

 

[louie3006]

directrix : x=h-a
= 1-4
= -3 ? how about this, does look right to you, or am i wrong ?