Posted by **doug** on Sunday, May 18, 2008 at 12:28pm.

determine vertex, focus and directrix of parabola. then graph the parabola.

second equation:

y^2 -4y -12x= 8

Please help me this is do 2day bc i forget to turn it in to my teacher

- Math -
**Damon**, Sunday, May 18, 2008 at 3:52pm
12 x + 8 = y^2 - 4 y

add 4 to both sides

12 x + 12 = y^2 - 4 y + 4

so

(y-2)^2 = 12 (x+1) = 4*3 (x+1)

opens right

vertex at (-1,2)

focus to vertex = 3 so focus at (2,2)

directrix to vertex = 3 so directrix at x = -4

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