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2x² - 5x = -1
x² - 5/2 x = - 1/2
(x- 5/4)² = - 1/2 + 25/16
(x - 5/4)² = 17/16
x - 5/4 = ± √ (17/16)
x = 5/4 ± 1/4√17
x1 = 5/4 + 1/4 √17 atau x2 = 5/4 - 1/4√17
atau
x1 = 1/4( 5 +√17) atau x2 = 1/4(5 - √17)