# How do you find the equation in standard form of the parabola whose focus is at (-2, 4) and whose directrix is at x = 4?

##### 1 Answer

Mar 3, 2017

#### Explanation:

Parabola is the locus of a point which moves whose distance from a given line called directrix and a point called focus is always constant.

Here we have directrix as

Distance of

and distance from focus

or

or

or

and for standard form it is

or

graph{x=-1/4y^2+2y-1 [-12.965, 7.035, -1, 9]}