How can I solve complex root problems without using De'Moivre's theorem?

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SUMMARY

The discussion centers on solving the square root of a complex number, specifically z = -9, without utilizing De'Moivre's theorem. The solution provided is z = ±3i, derived by separating the square root of the positive component and the imaginary unit. Participants confirm that this approach is valid and falls under the topic of complex roots, emphasizing the importance of correct notation in mathematical expressions.

PREREQUISITES
  • Understanding of complex numbers and imaginary units
  • Familiarity with square roots of negative numbers
  • Basic knowledge of mathematical notation
  • Awareness of De'Moivre's theorem and its applications
NEXT STEPS
  • Study the properties of complex numbers and their operations
  • Learn about alternative methods for finding complex roots
  • Explore the implications of De'Moivre's theorem in complex analysis
  • Investigate the geometric interpretation of complex numbers on the complex plane
USEFUL FOR

Students studying complex analysis, mathematicians exploring alternative methods for solving complex equations, and educators teaching the fundamentals of complex numbers.

alwaysconfuse
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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?
 
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