Question

What is the equation of the quadratic graph with a focus of (5, -1) and a directrix of y=1

Answer 1

since the directrix is y =1 (horizontal line), that means you have a vertical parabola.

(x-h)^2 = 4p (y - k )

Answer 2

A: f(x)=-1/4 (x-5)^2+1
B: f(x)=1/4(x-5)^2+1
C:f(x)=-1/4(x-5)^2
D: f(x)=1/4(x-5)^2
These are the answer choices @perl