Posted by Katie on Thursday, April 3, 2008 at 6:36pm.
write in form y=a(xh)^2+k
y=x^2x9
(x^22x)9
complete the square
(x^2+2x+11)9
(x^2+2x+1)19
(x+1)^29

Algebra  Reiny, Thursday, April 3, 2008 at 6:51pm
1  9 = 10
also your 2x mysteriously turned into +2x
so
(x1)^2  10 
Algebra  roro, Thursday, April 3, 2008 at 6:54pm
y= x^2 x  9
y=(x^2 x + 0.5^2  0.5^2) 9 ; we get 0.5 by dividing 1 by 2)
y=(x^2 x + 0.25)  0.25 9
y=(x0.5)^2  9.25 
Algebra  Reiny, Thursday, April 3, 2008 at 7:01pm
roro is correct, I misread your question