daca are radacina in Q , tip fractie fie divizorii D₀ / D₁
aici -1 /2
2 -3 3 -1
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x₁= 1/2 2 -2 2 0
rad . x₂ , x₃ din ecuatia 2x² -2x +2 =0
x² -x +1 =0 ; Δ=1-4 = -3 = 3i²
x₂ = (1 - √3i) /2 x₃= ( 1+√3i ) /2 dar sunt complexe conjugate