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p(y^2-1) =? if p(y^2+1) = 6y^4 - y^2 + 5

Source: 2000 Swedish Mathematical Competition p2

March 21, 2021
algebrapolynomial

Problem Statement

p(x)p(x) is a polynomial such that p(y2+1)=6y4y2+5p(y^2+1) = 6y^4 - y^2 + 5. Find p(y21)p(y^2-1).