Hi,

*Note: vertex form of a parabola, 

 where(h,k) is the vertex

vertex is (-2,8)

y = a(x+2)^2 + 8

y -intercept is 0. (0,0) a point on the parabola

0 = 4a + 8

-2 = a

y = -2(x+2) + 8

 

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