MathDB
P_1(X)=X-1, P_2(X)=X^2-X-1, P_n(X)=XP_{n-1}(X)-P_{n-2}(X)

Source: Moldova TST 2001

August 6, 2023
polynomial

Problem Statement

Let (Pn(X))nN(P_n(X))_{n\in\mathbb{N}} be a sequence of polynomials defined as: P1(X)=X1,P2(X)=X2X1,Pn(X)=XPn1(X)Pn2(X),n>2P_1(X)=X-1, P_2(X)=X^2-X-1, P_n(X)=XP_{n-1}(X)-P_{n-2}(X), \forall n>2. For every nonnegative integer nn{} find all roots of the polynomial Pn(X)P_n(X).