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x=-4 x=3 x1=-b-√Δ\2a=-1-7\2=-4
x2=-1+7\2=3
D=R\{-4;3}
5x\x³+x²-6x-6
x³+x²-6x-6
x²(x+1)-6(x+1)=0
(x+1)(x²-6)=0
(x+1)(x-√6)(x+√6)=0
x=-1 x=√6 x=-√6 D=R\{-1 ;-√6; √6}