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x4 - x3 - x - 1

rewriting: = x4 - 1 - x3 - x

factorising pair of terms: =(x2 + 1)*(x2 - 1) - x*(x2 + 1)

= (x2 + 1)*(x2 - 1 - x)

or (x2 + 1)*(x2 - x - 1)

which cannot be factorised further.

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13y ago

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