Question 622707
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Hi,
y = -x^2+ 8x- 8  |putting into Vertex form {{{a(x - h)^2 + k}}} 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
 {{{h = -b/2a = -8/-2 = 4}}}
 {{{k = c - b^2/4a =  -8 - 64/-4 = 8}}}