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OpenStudy (anonymous):
helpppp please. What value completes the square for the expression? x2 - 18x A. 9 B. -9 C. 81 D. -81 I said D. -81 but thats not right..
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OpenStudy (anonymous):
Try C
OpenStudy (ness9630):
No need to give away answers ._.
OpenStudy (anonymous):
x^2-18x+81 (x-9)^2. Sorry You're right Ness. I was actually confused as to if it was asking for the -9 or the 81 so I was curious hahah
OpenStudy (anonymous):
okay thanks!
OpenStudy (anonymous):
Do you understand why?
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OpenStudy (anonymous):
yes i think so thank you.
OpenStudy (anonymous):
Welcome! Remember, in quadratic the middle term comes from addition and the last term comes from multiplication when trying to factor.
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