Muhammad Al Khwarizmi

Muhammad Al Khwarizmi was born in Khwarezm in 780 AD and died in 850 AD. Not much was known about his life but he did have a very nice beard. He was an all rounder-

He wrote a book called Kitad Almukht Asir Fi Hisab Al-jabr Walmuqabala other wise known as "The Compendious Book On Calculation By
Completion And Balancing". The book goes over the very very foundation of the now advanced modern algebra such as-
  1. Quadratic Equations
  2. Algorithms
  3. Cancelling out-like terms
  4. Polynomial Equations to the second degree
and many more...

Al Khwarizmi also calculated the square using the mathmatical term: x2+10x=39