He understood about 0 and negative numbers. He knew that x = 9 had two solutions. He gives the formula
(ab) = ((a+(a-b))/2) ((a-(a-b))/2).
Baskara also studied Pell's equation x=1+py for p=8, 11, 32, 61 and 67. When p = 61 he found the solutions x =1776319049, y = 22615390. He studied many Diophantine problems.
Bhaskara's mathematical works include Lilavati (The Beautiful) and Bijaganita (Seed Counting) while he also wrote on astronomy, for example Karanakutuhala (Calculation of Astronomical Wonders).
References (11 books/articles)
References elsewhere in this archive:
Tell me about Pell's equation
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