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
(y2)^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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