A parabola opening up or down has vertex (0,6) and passes through (-8, -10). Write its equation in vertex form.

Answer 1

y = ax^2 +6, plug in (-8,-10) to calculate a

-10 = a(64)+6

a = -16/64 = -1/4

y = -(1/4)x^2 +6 which is downward opening