It was a book written in around AD 820 by a persian mathematician called Al-Kwarizmi. It's basically about algebra.
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many say that algebra was founded by diophantus but actually al- khwarizmi wrote about algebra [al- jabr] in his book 'compendious book on calculation by completion and balancing.'
The father of algebra is typically considered to be the Persian mathematician Muhammad al-Khwarizmi. He introduced the concept of algebra and its fundamental operations in his book "Kitab al-Jabr wa al-Muqabalah" (The Compendious Book on Calculation by Completion and Balancing). In this book, al-Khwarizmi laid the groundwork for solving equations and developing algebraic methods.
No single person founded algebra. In 830, the Persian mathematician,Muhammad Al-Khwarizmi published a book entitled “Al-Kitab al-mukhtasar fi hisab al-jabr wa'l-muqabala” (“The Compendious Book on Calculation by Completion and Balancing”). The book brought together algebraic knowledge from ancient Greece, India and China and also made inroad into solving quadratic equations.
Al-Khwarizmi, a Persian Muslim polymath wrote Al-Kitāb al-mukhtaṣar fī ḥisāb al-jabr wa-l-muqābala (Arabic: الكتاب المختصر في حساب الجبر والمقابلة‎, 'The Compendious Book on Calculation by Completion and Balancing') in 830 C.E. It was in this book that he first discussed the idea of "solving for the unknown" and proposed what we would now call the algebraic system for getting the answer.
Al-Khwarizmi, a Persian Muslim polymath wrote Al-Kitāb al-mukhtaṣar fī ḥisāb al-jabr wa-l-muqābala (Arabic: الكتاب المختصر في حساب الجبر والمقابلة‎, 'The Compendious Book on Calculation by Completion and Balancing') in 830 C.E. It was in this book that he first discussed the idea of "solving for the unknown" and proposed what we would now call the algebraic system for getting the answer.