What is the equation of the parabola with a focus at (3,18) and a directrix of y= -21?
1 Answer
Jul 29, 2017
Explanation:
Parabola is the locus of a pint, which moves so that its distance from a point called focus and a line called directrix is always equal.
Let the point on parabola be
its distance from focus
and distance from directrix
Hence equation of parabola is,
or
or
graph{(x^2-6x-78y-108)((x-3)^2+(y-18)^2-2)(x-3)(y+21)=0 [-157.3, 162.7, -49.3, 110.7]}