Hi,         

Using the vertex form of a parabola,  where(h,k) is the vertex

vertex of parabola is Pt(2,-9)

 y = a(x-2)^2 - 9    |Using x-intercept Pt(5,0) to solve for a

 0 = a*3^2 - 9

 9 = 9a

 a = 1

Graphing  y = (x-2)^2 - 9 



 

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