History of Hindu Mathematics: A Source Book v2.c17.s10.55

v2.c17.s10.55

"If then the difference of their squares, also the difference of them (are given): the difference of the squares is divided by the difference of them, and this (latter) is added to and subtracted from the quotient and then divided by two; (the results are) the residues; whence the number of elapsed days (can be found)."²