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History

Thus yd, ment x; Ted (from "kdla ka black) meant yj yd Jed bha, " x times y " ; Tea 15 Tea 10 3 " Vl5 VlO.

" The Indians were the first to recognise the existence of absolutely negative quantities.

They brought out the differ ence between positive and negative quantities by attaching to the one the idea of possession to the other that of debts The conception also of opposite directions on a line, as an interpretation of + and quantities, was not foreign to them.

They advanced beyond Diophantus in observing that a quad ratic has always two roots.

Thus Bhaskara gives x = 50 and x= 5 for the roots of x 2 - 45 x = 250.