The expression readily simplifies to the factor if two expressions as :
(x+y-2006)(x+y+1) = 0
find the number of points (x,y) with positive integral coordinates satisfying the
x^2 + y^2 + 2xy - 2005x - 2005y - 2006 = 0.
The expression readily simplifies to the factor if two expressions as :
(x+y-2006)(x+y+1) = 0