x⁴ - 3x³ - x + 3 = 0
(x⁴ - 3x³) - (x - 3) = 0
x³(x - 3) - (x - 3) = 0
(x - 3)(x³ - 1) = 0
1) x - 3 = 0
x₁ = 3
2) x³ - 1 = 0
x³ = 1
x₂ = 1
ответ : 1 ; 3
x⁴ - 3x³ - x + 3 = 0
(x⁴ - 3x³) - (x - 3) = 0
x³(x - 3) - (x - 3) = 0
(x - 3)(x³ - 1) = 0
1) x - 3 = 0
x₁ = 3
2) x³ - 1 = 0
x³ = 1
x₂ = 1
ответ : 1 ; 3