Posted by **Sabrina** on Friday, September 24, 2010 at 11:36pm.

I have tried several times to find the vertex, line of symmetry, max/min value of the quadratic function.

f(x)=-2x+2x+8

I know I have to do completing the square to answer this but everytime i try to follow the steps I stumble hard! a(x-h)^2+k x= -b/2a

x=-2/2(2)=-2/4=-1/2 x+-1/2

for y f(-1/2)

2(-1/2)^2+2(-1/2)+8

That is all i managed and am certain none of it is right either.

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