just having a problem with these 3 questions.(adsbygoogle = window.adsbygoogle || []).push({});

z E C such that Im z=2 and z^2 is real find z

well from my knowledge, it's will be x+2i, z^2 is (x^2 -4) + 4xi, since Im z= 2

then 4xi= 2? doesn't it, Umm don't really know what to do next

2nd questions

z E C such that Re z= 2Im z, and z^2 -4i is real, find x.

Umm don't have a clue on this one

Also 1 more

z EC such that z/(z-i) is real, show that z is imaginary

Thanks very much if you can help

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# Homework Help: Simple Complex number problem,

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