5.1 Introduction

A Complex Number is a combination of a Real Number and an Imaginary Number and is expressed in the form of \(a+i b\) where, \(a, b\) are real numbers and ‘ \(i\) ‘ is an imaginary number called “iota”. The value of \(i=\sqrt{-1}\). Because when we square \(i\) we get \(-1\), \(i^2=-1\).

For example, in the complex number \(3+i 2\), the real part is 3 and the imaginary part is 2.