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2(x³+1)+7(x²+x)=0
2(x+1)(x²-x+1) +7x(x+1)=0
(x+1)[2x²-2x+2+7x]=0
(x+1)(2x²+5x+2)=0
x=-1
Δ= 25-4*2*2= 25-16
Δ=9 √Δ=3
x1= -5-3/4=-2
x2= -5+3/4= -1/2
Odp. x= -1, x=-1/2, x=-2