x cube- 2 x square plus X + 1
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x cube- 2 x square plus X + 1=0
x square(x-2)+1(x+1)=0
(x square+1)(x-2)(x+1)=0
x square +1=0 x-2=0. x-1=0
x square = (-1) x=2 x=(-1)
negative is not possible
so answer is 2
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