Question

Derive the equation of the parabola with a focus at (0, -4) and a directrix of y = 4. (2 points)
Question 1 options:

1) f(x) = -16x2

2) f(x) = 16x2

3) f(x) = -1/16 x2

4) f(x) = 1/16 x2

Answer 1

hey there

Answer 2

where did you stuck

Answer 3

did you plot directrex and focus yet

Answer 4

http://prntscr.com/763dta
look at here

Answer 5

that's the focus and the directrix

Answer 6

from our knowledge of parabolas
we know that the parabola will open down towards the focus

Answer 7

so it would look like that