Derive the equation of the parabola with a focus at (2, 4) and a directrix of y = 8.

a. f(x) = -1/8 (x - 2)2 + 6

b. f(x) = 1/8 (x - 2)2 + 6

c. f(x) = -1/8 (x + 2)2 + 8

d. f(x) = 1/8 (x + 2)2 + 8

Derive the equation of the parabola with a focus at (2, 4) and a directrix of y = 8.

a. f(x) = -1/8 (x - 2)2 + 6

b. f(x) = 1/8 (x - 2)2 + 6

c. f(x) = -1/8 (x + 2)2 + 8

d. f(x) = 1/8 (x + 2)2 + 8