Question

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The parabola descends through left parenthesis negative 7.5 comma 20 right parenthesis and left parenthesis negative 5 comma 1 right parenthesis to its vertex at the plotted and labeled point left parenthesis negative 2 comma negative 8 right parenthesis. It continues upward through left parenthesis 1 comma 1 right parenthesis and left parenthesis 3.5 comma 20 right parenthesis. All values are approximate.

What is the vertex form of the equation in the graph?

(1 point)
y=
( x−

) 2+

Answer 1

y = (x + 2)^2 − 8

(Using vertex (-2,-8) and point (1,1): 1 = a(1+2)^2 − 8 → 1 = 9a − 8 → a = 1.)