I need help with numbers 11 and 12 in the attachted document.

I'm not trying to cheat because the answers are already given.. It's not marked work..

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- Oct 21st 2012, 01:19 PMBenja303Complex numbers help
I need help with numbers 11 and 12 in the attachted document.

I'm not trying to cheat because the answers are already given.. It's not marked work.. - Oct 21st 2012, 01:30 PMPlatoRe: Complex numbers help
- Oct 21st 2012, 01:33 PMBenja303Re: Complex numbers help
I'm completely lost, please explain what you have here

- Oct 21st 2012, 02:21 PMPlatoRe: Complex numbers help
This is not a tutorial service.

Both of those questions turn on this fact: $\displaystyle \frac{1}{z} = \frac{{\overline z }}{{\left| z \right|^2 }}$.

Example: $\displaystyle \frac{1}{3-4i}=\frac{3+4i}{25}$.

If $\displaystyle (1+3i)z=2+i$ then $\displaystyle z=\frac{(2+1)(1-3i)}{10}$.