Homework Help: math

Posted by Brittany on Monday, June 2, 2008 at 8:55am.

Find the equation of the parabola with it's focus at (-4,7) and directrix y=1

Is y+4=-1/12(x-4)^2 Right or is it
y-7=1/24(x=a)^2
y-4=1/12(x+4)^2
y-3=1/24(x+4)^2

math - drwls, Monday, June 2, 2008 at 9:57am
The vertex is between the directrix nd the focus, at y = 4. It is also at
x = 4, which means the equation must contain an x-4 term. That leaves you with
y-4 = 12(x+4)^2

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