MathDB
Rational solutions a^2 + c^2 + 17(b^2 + d^2)=21, ab + cd = 2

Source:

September 1, 2010
algebrasystem of equationsDiophantine EquationspolynomialIMO ShortlistIMO Longlist

Problem Statement

Find all rational solutions of a2+c2+17(b2+d2)=21,a^2 + c^2 + 17(b^2 + d^2) = 21,ab+cd=2.ab + cd = 2.