help again :S

**Petrus** · September 18th 2012, 08:10 AM

this one i got no ide what to do =S, i dont get it how i should do:
soulve the ekvation

The solution should be of the form a+bi

**Plato** · September 18th 2012, 08:19 AM

Originally Posted by Petrus

this one i got no ide what to do =S, i dont get it how i should do:
soulve the ekvation

The solution should be of the form a+bi

$-13\text{Re}(z)=2~\&~15\text{Im}(z)=9$

**Petrus** · September 18th 2012, 08:45 AM

ehmm i dont get it...

**Plato** · September 18th 2012, 08:54 AM

Originally Posted by Petrus

ehmm i dont get it...

Well the real part of the expression oh the left must equal the real part of the expression on the right.
Same idea for the imaginary parts.

**Petrus** · September 18th 2012, 09:04 AM

how can i see the re and im on z?

**Plato** · September 18th 2012, 09:14 AM

Originally Posted by Petrus

how can i see the re and im on z?

If $z=a+bi$ then $\text{Re}(z)=a~\&~\text{Im}(z)=b$

$\text{Re}(2+9i)=2~\&~\text{Im}(2+9i)=9$

$\text{Re}(z-14\overline{z})=-13a~\&~\text{Im}(z-14\overline{z})=15b$

**Petrus** · September 18th 2012, 09:24 AM

a = -2/13 is correct
b = 9/15 is wrong ( acording to the computer program) what do i do wrong?

**MarkFL** · September 18th 2012, 09:49 AM

Try reducing 9/15...

**Petrus** · September 18th 2012, 09:52 AM

heheh ty ur best

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