Г)x^3-11x^2+28x=0
Д)x^3+7x^2=18x
Е)5x^4-6x^3+x^2=0
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X=0 x^2-11x+28 =0
D = 121 - 112 = 9= 3^2
X1 = 7 X2=4
x^3+7x^2-18x = 0
x(x^2 +7x - 18) = 0
x=0 x^2+7x-18 = 0
D = 49 +72 = 121 = 11^2
x1 = 2 X2 = -9
5x^4-6x^3+x^2=0
X^2(5x^2 - 6x + 1) =0
x^2 =0 5x^2 - 6x +1 =0
x = 0 D = 36 -20 = 16 = 4^2
x1 = 1 x2=0.2