Ответы на вопрос:
D=b²-4ac
x1,2=(-b±корень D) /2a
1
D=36+108=144
X1=-3
X2=9
2
D=81-80=1
X1=5
X2=4
3
D=81-80=1
X1=0.4
X2=0.5
4
D=256
X1=-0.33
X2=0.43
5
D=116
X1=-1.39
X2=1.39
6
D=152
X1=4.08
X2=-2.08
7
D=0
X=2.33
8
D=-48
Действительных корней нет
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