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Find all complex numbers z such that |z3|=|z+i|=|z3i|. Please help solve asap! Its ok if u dont have an explanation.

 Oct 13, 2018
edited by somebody  Oct 13, 2018
 #1
avatar+118696 
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Hi somebody,

If any of my complex number questions prove to be wrong (or you have reason to question my answers) can you please let me know. :)

 

Find all complex numbers  z such that

|z - 3| = |z+i| = |z -3i|

 

letz=a+bi|(a3)+bi|=|a+(b+1)i|=|a+(b3)i|(a3)2+b2=a2+(b+1)2=a2+(b3)2a26a+9+b2=a2+b2+2b+1=a2+b26b+96a+9=2b+1=6b+9 2b+1=6b+98b=8b=1 6a+9=36a=6a=1

 

So I get     

 

z=1+i

 Oct 13, 2018
 #2
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Yah Melody thats what i got

 Oct 13, 2018
 #4
avatar+118696 
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Thanks guest :)

Melody  Oct 13, 2018
 #3
avatar+116 
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Yes, I'm pretty sure that is right. Thank you sooo much tho!!! i finally figured out that u have to substitute z = a+bi. THanks again!!!

 Oct 13, 2018

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