Question

What is the equation of the quadratic graph with a focus of (5, 6) and a directrix of y = 2?

f(x) = one eighth (x + 5)^2 + 4
f(x) = −one eighth (x − 5)^2 + 4
f(x) = one eighth (x − 5)^2 + 4
f(x) = one eighth (x + 5)^2 − 4

Answer 1

@mathmath333 @undeadknight26 @dan815

Answer 2

@freckles

Answer 3

the vertex is halfway between the focus and the directrix
I like to look at a visual...