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2x²*2+x³+x²+3x-1≤0
x³+5x²+3x-1≤0
1 5 3 -1
-1 0 -1 -4 1
1 4 -1 0
(x+1)(x²+4x-1)≤0
(x+1)(x-(-2-√5))(x-(-2+√5))≤0
x∈(-∞,-2-√5>u<-1,-2+√5> i x∈N to x=0