History of Hindu Mathematics: A Source Book v2.c17.s14.38

v2.c17.s14.38

The rule is somewhat cryptic because the word *dvidhā* (twice) has been employed with double implication. According to one, the earlier operations of finding roots are made on two optional numbers with two optional interpolators, and with the results thus obtained the subsequent operations of their composition are performed. According to the other implication of the word, the earlier operations are made with one optionally chosen number and one interpolator, and the subsequent ones are carried out after the repeated statement of those roots for the second time. It is also implied that in the composition of the quadratic roots their products may be added together or subtracted from each other.