Question

Fan and Medal

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

f(x) = −one eighth (x − 2)2 + 6

f(x) = one eighth (x − 2)2 + 6

f(x) = −one eighth (x + 2)2 + 8

f(x) = one eighth (x + 2)2 + 8

Answer 1

All I can really gather from that is that it's negative, so that narrows it down to A or C.

Answer 2

what is the vertex?

Answer 3

(2,6) yes?

Answer 4

so A