x3 - 3x² + 4 Ix + 1
-(x³ + x² ) x³ - 4x + 4
- 4x² + 4
-( -4x² – 4x)
4x + 4
-(4x + 4)
0
x³ - 3x² + 4 = (x + 1)(x³ - 4x + 4) = (x + 1)(x - 2)²
x₁ = - 1
x₂ = x₃ = 2