# Math Help - Complex number theorem proof

1. ## Complex number theorem proof

How to proof this theorem:

a’ : b’ = (a : b)’

(a and b complex numbers)

2. Originally Posted by Bernice
How to proof this theorem:

a’ : b’ = (a : b)’

(a and b complex numbers)
Write $a=u+iv$ and $b=a+ib$ then expand both $a'/b'$ and $(a/b)'$ and reduce to standard form and the result will be evident.

CB