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January 31, 2015

January 31, 2015

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

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.

- Math I have tried it and tried it -
**Sabrina**, Saturday, September 25, 2010 at 7:58amOkay I think I have this:

vertex: x=1/2 y=17/2

equation of line of symmetry: x=1/2

Maximum value of f(x)=17/2

Am I correct?

- Math I have tried it and tried it -
**Reiny**, Saturday, September 25, 2010 at 8:25amYou are correct

Good for you!

- Math I have tried it and tried it -
**Sabrina**, Saturday, September 25, 2010 at 9:20amThanks Reiny

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