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