Question

Need this ASAP!

A parabola opening up or down has vertex (0,0) and passes through (-20, 20). Write its
equation in vertex form.

Answer 1

Below.

Explanation:

F(x) = (x - 20)(x + 20)

f(x) = x^2 - 400 This opens upwards.

If it opens down we have:.

f(x) = -(x - 20)(x + 20)

f(x) = -x^2 + 400.