Решите уравнение х^2=18-7х
x^2+7x-18=0
D=7^2+4*18=121
x1=-9
x2=2
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D=49+4*18=121
X1=(-7-11)/2=-9
X2=(-7+11)/2=2
x^2+7x-18=0
D=7^2+4*18=121
x1=-9
x2=2