Complex number

 What is Complex number?

Imaginary number i is called complex number. Many places we use complex number like Math and Quantum Physics.

But we do not  know about this. Where it come?

Math has two dimensions. 

Real number on x-axis 

imaginary number on y-axis

When we take under root of 4 it give us value 2.Under root always gives us less value.

On the other hand when we take under root of -4 it gives us -2 it means large value, that is impossible. Due to this we use imaginary number because we know under root negative value move to other world of math. We do not know about this world of Math due to this we use name of imaginary number.

We can change imaginary number into Real number by multiply imaginary number itself.

One day Math will be able to know about imaginary number that is imaginary.