anonymous
  • anonymous
how do I simplify (3+5i)^4?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
just expand , you could get it into mod arg form and use demoivres theorm but that wont give exact answer
anonymous
  • anonymous
ie do (3+5i)^2 (3+5i)^2 and expand, or use binomial theorm/pascals triangle expansion coeffiecents
anonymous
  • anonymous
(3+5i)^2 (3+5i)^2 = -16+30i

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anonymous
  • anonymous
I got that answer...does that mean I do it twice?
radar
  • radar
My guess is to expand taking (3+5i)(3+5i)=-16+30i then take (-16+30i)(-16+30) = -644-960i
anonymous
  • anonymous
okay...that is what I was starting to do.
radar
  • radar
Did you come up with the same results? I must admit the outcome does not look any simpler!!

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