Question

Derive the equation of the parabola with a focus at (4, –7) and a directrix of y = –15. Put the equation in standard form.

Answer 1

f(x) = ((1/16)x^2) – (1/2x) + 11
am i right? @ganeshie8

Answer 2

Looks perfect!

Answer 3

yay! thank you! :)

Answer 4

hey waIt wait

Answer 5

yeah that was the last question and i got it wrong :(

Answer 6

the constat term doesn't look right

Answer 7

what should it be

Answer 8

f(x) = ((1/16)x^2) - (1/2x) - 10

Answer 9

try that

Answer 10

use wolfram to double check ur answer
http://www.wolframalpha.com/input/?i=focus+f%28x%29+%3D+%28%281%2F16%29x%5E2%29+%E2%80%93++%281%2F2x%29+-10