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2017 preRMO p19, 1,2,3 roots of x^4 + ax^2 + bx = c

Source:

August 9, 2019
algebrarootspolynomial

Problem Statement

Suppose 1,2,31, 2, 3 are the roots of the equation x4+ax2+bx=cx^4 + ax^2 + bx = c. Find the value of cc.