Hi,

y = -x^2+ 8x- 8  |putting into Vertex form  by completing the Square

y = -(x-4)^2 + 16 - 8

y = -(x-4)^2 + 8   V(4,8)   (h is 4 and k is 8)



Note: In general: y = ax^2 + bx + c

If you need a shortcut on this: y = -x^2+ 8x- 8, (a = -1, b = 8 and c = -8)

In general: y = ax^2 + bx + c .... going to y = a(x-h)^2 + k ... following is true

 

 

 

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