What is the very first book concerning algebra?

Answer 1

Although the history of algebra can be traced back several millennia, the first systematic study of the subject was entitled "Al-jabr wa'l muqabalah" or "The Compendious Book on Calculation by Completion and Balancing". The book was written by the Muslim Persian mathematician Muhammad ibn Mūsā al-Khwārizmī , in Baghdad in the middle of the 9th Century.