X^3 - 3x^2 - 4x = 0,
x(x^2-3x-4)=0,
x1=0,
x^2-3x-4=0,
x2=-1, x3=4;
(2x - 1)^4 - x^2 = 0,
((2x-1)^2)^2-x^2=0,
((2x-1)^2-x)((2x-1)^2+x)=0,
(2x-1)^2-x=0,
4x^2-5x+1=0,
D=9,
x1=1/4, x2=1;
(2x-1)^2+x=0,
4x^2-3x+1=0,
D=-7<0; нет решений<br>
x^3 - 3x^2 - x +3 = 0,
x^2(x-3)-(x-3)=0,
(x-3)(x^2-1)=0,
x-3=0, x1=3;
x^2-1=0, x^2=1, x2=-1, x3=1