Square root of negative numbers was considered as early as 1st Century. However the first major work
using Complex numbers occurred in the 1500‟s as solution of a Quadratic Equation. However mathematicians
did not readily accept the complex numbers. It took centuries to convince mathematicians to accept complex
numbers. The reason for this could be the lack of a geometric definition of complex numbers as roots of
Quadratic functions, while the real roots have a geometric definition.