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I barely remember that I could identify them by attempts. I would get the coefficient, see what numbers can divide it and put them into the Ruffini's rule.

But I don't even know what such method is called.

share|cite|improve this question maybe? – Myself Feb 7 '11 at 20:05
Rational Root Theorem, that's exactly what I was looking for. Thanks, Yuval. – user6756 Feb 7 '11 at 20:25
Do you still need the algorithm of how to find these or your question is answered? – fdart17 Feb 7 '11 at 20:38

The OP was after the Rational root theorem.

(Added so the question could be officially answered.)

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