around 1070–1079 CE
Examples of elementary algebra to cubic equations
Omar Khayyam’s Maqalah fi al-jabr wa-al muqabalah provides examples of algebra, including definitions and discussions on cubic equations. Khayyam composed the treatise in Samarkand under the patronage of Samarkand's governor, Abu Tahir Abd al-Rahman ibn 'Alaq, most likely between the years 1070–1079 CE.
Khayaam is more well known as the author of the Rubáiyát in the Western World, but his works on mathematics had a profound influence on the Islamic world. He also worked as an astronomer for the court of Sultan Malik-Shah I (1054–1092). Fourteen other works were bound into this volume, with subjects ranging from astronomy to music to navigation.