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(x²+2x)²-x² = x⁴+4x³+2x²-x²=0
x²(x²+4x+1)=0
Δ=12
x₁=-(2+√3)
x₂=-(2-√3)
Czyli pierwiastkami tego wielomianu są x=0; x=-(2+√3); x=-(2-√3)