MathDB
India TST:Day 2 Problem 2

Source: hard

May 16, 2009
algebrapolynomialcomplex numbersalgebra proposed

Problem Statement

Let f(x) f(x)and g(y) g(y) be two monic polynomials of degree=n n having complex coefficients. We know that there exist complex numbers ai,bi,ci1in a_i,b_i,c_i \forall 1\le i \le n, such that f(x)\minus{}g(y)\equal{}\prod_{i\equal{}1}^n{(a_ix\plus{}b_iy\plus{}c_i)}. Prove that there exists a,b,cC a,b,c\in\mathbb{C} such that f(x)\equal{}(x\plus{}a)^n\plus{}c\text{ and }g(y)\equal{}(y\plus{}b)^n\plus{}c.