Help with quadratics?

"What is the equation of the quadratic graph with a focus of (4, −3) and a directrix of y = −6?"

How would I go about solving this and future questions like it?

Question

Help with quadratics?

"What is the equation of the quadratic graph with a focus of (4, −3) and a directrix of y = −6?"

How would I go about solving this and future questions like it?

campbell_st · Answer

so start by plotting the information on a simple number plane... that will help you determine the concavity of the parabola. 

the line of symmetry is x = 4 

the vertex is situated half way between the focus and directrix on the line of symmetry|dw:1465417383371:dw|