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W(-1)=-3+8-3-3=0 jest podzielny przez (x+1)
3x²(x+1)+5x(x+1)-2(x+1)=0
(x+1)(3x²+5x-2)=0
(x+1)(3x²+6x-x-2)=0
(x+1)*[3x(x+2)-(x+2)]=0
(x+1)(x+2)(3x-1)=0
x+1=0 v x+2=0 v 3x-1=0
Odp. x∈{-2, -1, 1/3}