Bhaskara's lemma

Bhaskara's lemma, named after the Indian mathematician Bhaskara II, provides a useful technique for finding integer solutions to certain types of Diophantine equations. Specifically, it relates to finding integer solutions for the equation of the form: \[ x^2 - dy^2 = N \] where \(d\) is a non-square positive integer, and \(N\) is a given integer.