History of Hindu Mathematics: A Source Book v2.c17.s8.36

v2.c17.s8.36

For the solution of the quadratic Brahmagupta uses also a third formula which is similar to the one now commonly used. Though it has not been expressly described in any rule, we find its application in a few instances. One of them is an interest problem: A certain sum (p) is lent out for a period (t₁); the interest accrued (x) is lent out again at this rate of interest for another period (t₂) and the total amount is A. Find x.