Posted by **Katie** on Thursday, April 3, 2008 at 6:36pm.

write in form y=a(x-h)^2+k

y=x^2-x-9

(x^2-2x)-9

complete the square

(x^2+2x+1-1)-9

(x^2+2x+1)-1-9

(x+1)^2-9

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