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What value completes the square for the expression? x2 - 18x A. 9 B. -9 C. 81 D. -81 i think its A but im not sure
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ax^2+bx:(b/2)^2 x^2-18x+(-18/2)^2=(-18/2)^2 so the value:81
It's A but don't you want to know why?
definitely not -81
it told me A is wrong .-.
well then it's -81
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