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OpenStudy (anonymous):
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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OpenStudy (anonymous):
ax^2+bx:(b/2)^2 x^2-18x+(-18/2)^2=(-18/2)^2 so the value:81
OpenStudy (anonymous):
It's A but don't you want to know why?
OpenStudy (anonymous):
definitely not -81
OpenStudy (anonymous):
it told me A is wrong .-.
OpenStudy (anonymous):
well then it's -81
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