Focus: (2,5) Diretrix: x= 4
You must first use the midpoint formula for the x-values in order to find the vertex. *Distance between focus and directrix is always the same*
Midpt.= (x1 + x2 / 2)
Plug in the values, and you get (3,5)
I found the y-values from the focus (2,5)
Next, you need to find the value of p by finding its distance. I subtracted 3 from 2 and got -1. Since p is negative, the graph is facing left.
Now you can make an equation--> x-3 = -1/4(y-5)^2