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# Complex number short question watch

1. how to find arg (b+ia) if arg (a+ib)=theta and a >0 and b>0
2. (Original post by crystalong)
how to find arg (b+ia) if arg (a+ib)=theta and a >0 and b>0
Can you see that if then ? You should then think about what complex conjugation and negation do to the argument.
3. (Original post by Gregorius)
Can you see that if then ? You should then think about what complex conjugation and negation do to the argument.
why is -z=b+ia?
4. (Original post by crystalong)
why is -z=b+ia?
My apologies, it should read .
5. (Original post by Gregorius)
My apologies, it should read .
why is ?
6. (Original post by crystalong)
why is ?
7. (Original post by Gregorius)
oh, thank you!

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Updated: March 16, 2016
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