SOLUTION: what number should be added to complete the square of the expression x^2-6x?

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Question 366528: what number should be added to complete the square of the expression x^2-6x?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
(1/2) of the x-coefficient, squared.
N=%28%281%2F2%29%28-6%29%29%5E2=%28-3%29%5E2=highlight%289%29
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x%5E2-6x%2B9=%28x-3%29%5E2