Question

Using a directrix of y = 2 and a focus of (3, -4), what quadratic function is created?

Answer 1

would you like to derive it or would you just like to use the formula
in either case it helps me to visual things to do either
so I graph a few things like the directix and the focus and the vertex and the parabola itself

Answer 2

now the vertex is halfway between (3,2) and (3,-4)