Question

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

f(x) = −one fourth (x − 5)2 + 1
f(x) = one fourth (x − 5)2 + 1
f(x) = −one fourth (x − 5)2
f(x) = one fourth (x − 5)2

Answer 1

i like to draw first...

the vertex will be halfway between the directrix and the focus

Answer 2

what are the coordinates for V