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Polynomial satisfying xP(x - a) = (x - b)P(x) for given a,b.

Source: Vietnam MO 1984 P5

March 20, 2011
algebrapolynomialalgebra unsolved

Problem Statement

Given two real numbers a,ba, b with a0a \neq 0, find all polynomials P(x)P(x) which satisfy xP(xa)=(xb)P(x).xP(x - a) = (x - b)P(x).