(x-1)^3+1
(a-b)3 = a3 - 3a2 b + 3ab2 - b3
(x-1)³+1 = x³-3x²+3x-1+1=x³-3x²+3x=x(x²-3x+3)
x²-3x+3>0
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(a-b)3 = a3 - 3a2 b + 3ab2 - b3
(x-1)³+1 = x³-3x²+3x-1+1=x³-3x²+3x=x(x²-3x+3)
x²-3x+3>0