A parabola is located at (4,0), and the directrix is located at x = –4.

1 answer:

8 0

focus = (h+p, k) = (0+p, 0)
(4,0) = (p, 0)
p = 4
y^2 = 4px
y^2 = 4(4)x
y^2 = 16x

Equation of the directrix is x=h-p
x = 0-4
x= -4

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