Derive the equation of the parabola with a focus at (−2, 4) and a directrix of y = 6. Put the equation in standard form. (2 points) f(x) = one fourth x2 − x + 4 f(x) = − one fourth x2 − x + 4 f(x) = one fourth x2 − x + 5 f(x) = − one fourth x2 − x + 5