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OpenStudy (anonymous):
What number completes the square? x^2 - 18x + _ A. 81 B. 64 C. 36 D. 324
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OpenStudy (***[isuru]***):
hi, this time... It's \[(x -9)^{2} = x ^{2} -18x +81\] Don't u know about the completing square ? Do u need help ?
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