# What is the vertex form of the equation of the parabola with a focus at (15,-5) and a directrix of #y=7 #?

##### 1 Answer

Nov 28, 2015

Conic form:

#### Explanation:

We know this up/down parabola

General equation

Focus

Directrix:

Focus

1)

Directrix:

2)

Now we have system of equation (add both equations)

Now we solve for

Conic form

**Answer:**