Factoring polynomials over real and complex numbers

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SUMMARY

The discussion focuses on the factorization of the polynomial z8 - 15z4 - 16 over both complex and real numbers. It is established that factoring over complex numbers allows for linear factors with complex coefficients, while factoring over real numbers restricts factors to real coefficients, which can be either linear or quadratic. The participants clarify the distinction between these two methods of factorization, emphasizing the implications for the types of coefficients involved.

PREREQUISITES
  • Understanding of polynomial factorization
  • Familiarity with complex numbers and their properties
  • Knowledge of linear and quadratic equations
  • Basic algebraic manipulation skills
NEXT STEPS
  • Study polynomial factorization techniques over complex numbers
  • Learn methods for factoring polynomials with real coefficients
  • Explore the use of the Rational Root Theorem in polynomial factorization
  • Investigate the application of synthetic division in polynomial division
USEFUL FOR

Students studying algebra, mathematicians interested in polynomial theory, and educators teaching complex and real number factorization methods.

NewtonianAlch
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Homework Statement


Factorise z^{8} -15z^{4} - 16 over the Complex numbers and Real numbers


The Attempt at a Solution



I factorised over the complex numbers, I'm not sure what they mean by over the real numbers.

Do I substitute z = (x + iy) and then do it by expanding and separating real from complex? I would have tried it at first, except these are powers to the 8, which seems like an unlikely method.
 
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Hi NewtonianAlch! :smile:
NewtonianAlch said:
I factorised over the complex numbers, I'm not sure what they mean by over the real numbers.

over the complex numbers means that the factors have (possibly) complex coefficients (and will all be linear)

over the real numbers means that the factors have real coefficients (and will be either linear or quadratic) :wink:
 

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