Question

In which form is the following function written?

y+20=8(x+7)^2

Answer 1

Vertex!

(just got it right)

Answer 2

(a variation of) vertex form

Explanation:

For vertical scale factor "a" and vertex (h, k), the vertex form of the equation for a parabola can be written as ...

y = a(x -h)^2 +k

If k is subtracted from this equation, an alternate form is ...

y -k = a(x -h)^2

This latter version of vertex form is the form your equation has, where ...

• a = 8
• (h, k) = (-7, -20)