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x² -4x +4 +x³ -8=0
x³ +x² -4x -4 =0
x²(x+1) -4(x+1)=0
(x+1)(x² -4)=0
(x+1)(x-2)(x+2)=0
x+1=0 ∨ x-2=0 ∨ x+2=0
x₁=-1 ∨ x₂= 2 ∨ x₃= -2
Odp. x∈{ -2, -1, 2}