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OpenStudy (anonymous):
-7n(n-4)-5n=124
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OpenStudy (anonymous):
-7n^2 +28n -5n = 124 7n^2 -23n +124 = 0 \[n = (-b \pm \sqrt{b^2 - 4ac} )\div 2a\] So n = 5.51 or n = -2.23 (roughly) I think...
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