Question

Find the standard form of the equation of the parabola with a focus at (-7, 0) and a directrix at x = 7.

Answer 1

ok, so your focus is at (-7, 0), and the directrix is at x=7

Answer 2

the distance from the focus to the directrix for a parabola is exactly the same distance, thus the vertex of it is at the origin, so the parabola is opening leftwards