5. Write an equation for a parabola with each given focus and directrix.

a. focus: (5,2); directrix: x-axis
b. focus: (-2,3); directrix: the line y=7
c. focus: (0,7); directrix: x-axis
d. focus (-3,4); directrix: the line y = -1

1 answer

a. (x-5)^2 + (y-2)^2 = (y+2)^2
b. (x+2)^2 + (y-3)^2 = (y-7)^2
c. (x-0)^2 + (y-7)^2 = (y+7)^2
d. (x+3)^2 + (y-4)^2 = (y+1)^2
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