# What is the standard form equation of the parabola with a vertex at (0,0) and directrix at x= -2?

##### 1 Answer

May 30, 2017

#### Explanation:

Please observe that the directrix is a vertical line, therefore, the vertex form is of the equation is:

where

Substitute the vertex,

Simplify:

Solve equation [2] for "a" given that

Substitute for "a" into equation [3]:

Here is a graph of the parabola with the vertex and the directrix: