4х^2 + 4х = - 1
4х^2 + 4х + 1 = 0
D = 2^2 - 4 = 4 - 4 = 0
x = -2/4 = - 0,5
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4х^2 + 4х = - 1
4х^2 + 4х + 1 = 0
D = 2^2 - 4 = 4 - 4 = 0
x = -2/4 = - 0,5