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Complex numbers root problems

  • #1

Homework Statement


What is the square root of z=-9


Homework Equations





The Attempt at a Solution


Is it possible of me to not use De'Moivre's theorem to solve this question??
Solution :
z= [itex]\sqrt{-9}[/itex]
z=[itex]\sqrt{9}[/itex] x [itex]\sqrt{}-1[/itex]
z=[itex]\pm3[/itex] i

Will this method be acceptable?? Is this still under the topic complex roots?
 

Answers and Replies

  • #2
lanedance
Homework Helper
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