# Homework Help: Complex analysis

1. Feb 28, 2009

### asi123

1. The problem statement, all variables and given/known data

Hey guys.

I have this problem, I need to show that it's true and I don't have a clue.
I tried to do like alpha = x+yi but it got me nowhere, any ideas?

Thanks.

2. Relevant equations

3. The attempt at a solution

#### Attached Files:

• ###### 1.jpg
File size:
3.9 KB
Views:
101
2. Feb 28, 2009

### yyat

Try to show that

$$|1-\bar{\alpha}z|^2=|z-\alpha|^2$$ if and only if $$|z|^2=1$$

and keep in mind that

$$|w|^2=w\bar{w}$$.

3. Feb 28, 2009

Thanks.