Решаем методом интервалов
x^2-x-12=0
D=49
x1=-3
X2=4
+-+
-------(-3)-------(4)------>x
x€(-3;4)
x>0 => x=1, x=2, x=3
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Решаем методом интервалов
x^2-x-12=0
D=49
x1=-3
X2=4
+-+
-------(-3)-------(4)------>x
x€(-3;4)
x>0 => x=1, x=2, x=3