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Best Answer
x2 + 5x = 60
x2 + 5x + 25/4 = 60 + 25 / 4
(x + 5/2)2 = 265/4
x + 5/2 = (265/4)1/2
x = -5/2 ± √265 / 2
x = -(5 ± √265) / 2
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