write the equation in vertex form, of a parabola with vertex (5, -1) and that passes through the point (6, 8)

Answer 1

Y = a(x-h)^2 + k.
8 = a(6-5)^2 - 1,
8 = a - 1, a = 9.

Y = 9(x-5)^2 - 1.