Abu Ja'far Muhammead ibn Musa
Al-Khwarizmi
(about 780 (Baghdad) - about 850)
Al-Khwarizmi wrote the book:
Hisab al-jabr w'al muqabala

Aim: To explain how to solve equations:

  • Linear equations
  • Quadratic equations
al-jabr

adding equal terms to both sides of an equation
(say in order to eliminate negative terms)
Also: Multiplying both sides of an equation by one and the same number.
muqabala subtraction equal amounts from both sides of an equation
al-jabr
w'al
muqabala
performing algebraic operations

al-jabr → ALGEBRA      
Al-Khwarizmi → ALGORITHM