History of Hindu Mathematics: A Source Book v2.c17.s23.68

v2.c17.s23.68

Substituting in the second equation, we get $(a'α² + b'α + c')y² + d' = v²,$ which can be solved by the method of the Square-nature. This method is equally applicable if the unknown part in the second equation is of a different kind but still of the second degree.