х³+3х²-х-3=0
(х³+3х²)-(х+3)=0
Х²(х+3)-1(х+3)=0
(х+3)(х²-1)=0
(х+3)(х-1)(х+1)=0
х+3=0 или х-1=0 или х+1=0
х₁ =-3; х₂=1 ; х₃ =-1
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х³+3х²-х-3=0
(х³+3х²)-(х+3)=0
Х²(х+3)-1(х+3)=0
(х+3)(х²-1)=0
(х+3)(х-1)(х+1)=0
х+3=0 или х-1=0 или х+1=0
х₁ =-3; х₂=1 ; х₃ =-1