1. Complex numbers

Write an expression in standard form for the quotient (a + bi)/(c+di) of two complex numbers.

Thanks in advance for any help!

2. (a + bi)/(c+di) = $\frac {a+bi}{c+di} = \frac {(a+bi)(c-di)}{(c+di)(c-di)}= \frac {ac-adi+bci+bdi^2}{c^2-d^2i^2} = \frac {ac+bci-adi-bd}{c^2+d^2} = \frac {(ac-bd+(bc-ad)i}{c^2+d^2} = \frac {ac-bd}{c^2+d^2} + \frac {bc-ad}{c^2+d^2}i$

3. (a + bi)/(c+di) =

4. Sorry, there is a mistake, i will try again