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x² - 5x = - 6
(x - 5/2)² = -6 + (25/4) = 1/4
x- 5/2 = 1/2 atau x - 5/2 = - 1/2
x = 1/2 + 5/2 atau x = -1/2 + 5/2
x = 3 atau x = 2
<2>
a= 3 , b = 8, c = 4
x= -8 +_ √(64 - 48) / (6)
x = (-8 +6)/ (6) atau x = (-8-6)/(6)
x = -2/6 atau x = -14/6
x = - 1/3 atau x= - 7/3