X^3 - 3x^2 + 2 = 0
Сгруппируем
x^3 - x^2 - 2x^2 + 2 = 0
x^2 (x - 1) - 2(x^2 - 1) = 0
x^2 (x - 1) - 2(x - 1) (x + 1) = 0
(x - 1) (x^2 - 2(x + 1)) = 0
1) x - 1 = 0
x = 1 ;
2) x^2 - 2(x + 1) = 0
x^2 - 2x - 2 = 0
D = 4 + 8 = 12
x₁ = (2 + 2√3)/2 = 1 + √3;
x₂ = ( 2 - 2√3)/2 = 1 - √3;
Ответ:
1; 1 - √3; 1 + √3