Sum of 2 certain square is not a prime
Source: Indonesia Mathematics Olympiad 2004 Day 2 Problem 2
October 22, 2009
quadraticsVietaalgebra
Problem Statement
Quadratic equation x^2\plus{}ax\plus{}b\plus{}1\equal{}0 have 2 positive integer roots, for integers . Show that a^2\plus{}b^2 is not a prime.