SOLUTION: Find the standard form of the equation of the parabola with a focus at (0, -9) and a directrix y = 9. PLEASE ANSWER FAST AND SHOW ALL WORK!! THANK YOU SO MUCH IN ADVANCE :)

Algebra ->  Quadratic-relations-and-conic-sections -> SOLUTION: Find the standard form of the equation of the parabola with a focus at (0, -9) and a directrix y = 9. PLEASE ANSWER FAST AND SHOW ALL WORK!! THANK YOU SO MUCH IN ADVANCE :)      Log On


   



Question 1094383: Find the standard form of the equation of the parabola with a focus at (0, -9) and a directrix
y = 9.
PLEASE ANSWER FAST AND SHOW ALL WORK!! THANK YOU SO MUCH IN ADVANCE :)

Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Vertx, exactly between focus and directrix, (0,0).
9 is distance from vertex and either directrix or focus.
%28x-0%29%5E2=-4p%28y-0%29
x%5E2=-4py, p=9

-36y=x%5E2
(adjust to any form you want.)