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OpenStudy (anonymous):
solve the quadratic equation by completing the square x^2+18x+76=0
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OpenStudy (anonymous):
x^2 + 2.9.x +9^2 +76 -9^2=0 (x+9)^2=81-76 x+9=+-\[\sqrt{5}\] x=-9\[\pm \sqrt{5}\]
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