Complex Numbers

Imaginary Number:
Sqrt(-1) = i
Remember that  i^2 = -1, when multiplying

How to take the square root of a negative number:
Sqrt(-32) = 4i*sqrt(2)

Operations with complex numbers:

乙 ) + 20 
29 
25

Multiplication of complex expressions:

A complex expression:
C = a +bi

What complex and imaginary numbers are:

Complex numbers 
Real numbers 
5 
Imaginary numbers 
v/5i -12.2i 3i