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(x³+x)+(3x²+3)=x(x²+1)+3(x²+1)=(x²+1)(x+3)
(x²+1)=0 lub (x+3)=0
x=-3 sprzeczność
x²(x+3)+1(x+3)=0
(x+1)(x+3)=0
x+1=0∨x+3=0
x=-1∨x=-3
(x³+x)+(3x²+3)=
=x(x²+1)+3(x²+1)=
=(x²+1)(x+3)
x+1=0
x+3=0
x=-1
x=-3