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x3=-8
x=pierwiastek 3 stopnia z (-8)
x=-2
x3-2x=0
x(x2-2)=0
x1=0
(x2^2-2)=0
x1=0
x2=pierwiastek kwadratowy z 2)
x^3 + 8 = 0
x^3 = -8
x^3 = (-2)^3
x = -2
b)
x^3 - 2x = 0
x(x^2 - 2) = 0
x = 0
lub
x^2 - 2 = 0
(x + V2)(x - V2) = 0
x + V2 = 0
x = -V2
lub
x - V2 = 0
x = V2
x E {-V2; 0; V2]