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x² - 7/2 x - 5= 0
(x²- 7/2 x) = 5
(x - 7/4)² = 5 + 49/4 = 69/4
x - 7/4 = 1/4 √ 69 atau x - 7/4 = - 1/4√69
x = 7/4 + 1/4√ 69 atau x = 7/4 - 1/4√69
x = 1/4 (7 + √69) atau x = 1/4(7-√69)