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posted by Jack Thursday, September 20, 2012 at 7:50am.
2x^2 + 5x - 8 = 0 Solve the quadratic equation by completing the square.
x^2 + (5/2)x = 4 x^2 + (5/2)x + 25/16 = 4 + 25/16 (x + 5/4)^2 = 89/16 x + 5/4 = ± √89/4 x = (-5 ± √89)/4
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