solution of a3-a2+a-1 from factorisation
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a^3 - a^2 + a - 1 = 0
a^2(a - 1) + 1 (a - 1) =0
(a^2 + 1) (a - 1) = 0
a^2 + 1 = 0
a^2 = -1
a = 1
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