Find the equation of parabola, whose directrix is #y=9# and vertex is #(0,0)#?
1 Answer
Nov 26, 2017
Explanation:
We have directrix as
focus is
or squaring each side
or
graph{(36y+x^2)(y^2+x^2-0.4)((y+9)^2+x^2-0.4)(y-9)=0 [-40, 40, -20, 20]}