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OpenStudy (anonymous):
What number must you add to complete the square? x2 + 4x = 15 A. 16 B. 4 C. 2 D. 8
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OpenStudy (solomonzelman):
it is \({\normalsize\color{red}{ \rm (b/2)^2 }}\)
OpenStudy (solomonzelman):
(b in your case is 4.)
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