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October 21, 2014

October 21, 2014

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

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

- Algebra -
**Reiny**, Thursday, April 3, 2008 at 6:51pm-1 - 9 = -10

also your -2x mysteriously turned into +2x

so

(x-1)^2 - 10

- Algebra -
**roro**, Thursday, April 3, 2008 at 6:54pmy= 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=(x-0.5)^2 - 9.25

- Algebra -
**Reiny**, Thursday, April 3, 2008 at 7:01pmroro is correct, I misread your question

- Algebra -

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