Root Theorem for Polynomials of Degree > 2

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SUMMARY

The discussion centers on the Root Theorem for polynomials of degree greater than 2, which states that if a polynomial \( \Omega \) with real coefficients has a complex root \( z = a + bi \), then its conjugate \( \overline{z} = a - bi \) is also a root. This theorem is straightforward for quadratic polynomials like \( \Omega(x) = x^2 + px + q \) but poses challenges for higher-degree polynomials. The theorem is often referenced alongside the Fundamental Theorem of Algebra (FTA) but lacks a specific name for degrees greater than 2.

PREREQUISITES
  • Understanding of complex numbers and their conjugates
  • Familiarity with polynomial functions and their properties
  • Knowledge of the Fundamental Theorem of Algebra (FTA)
  • Basic skills in mathematical proof techniques
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What is the theorem that states if [tex]\Omega[/tex] is a polynom with degree > 1 with real coefficients. If there exists a complex number [tex]z = a + bi[/tex] such that [tex]\Omega(a+bi)=0[/tex] then [tex]\overline{z} = a - bi[/tex] is also a root of [tex]\Omega[/tex]? For [tex]\Omega(x) = x^2 + px + q[/tex] with p and q real then if a+bi is a root then a-bi is also a root if [tex]b \neq 0[/tex], that one is easy but I don't think it's easy for degree > 2 to prove it that's why I'm search for it's name.
 
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it doesn't have a name, as far as i know, and it is easy to prove. if z is a root of P, then z* is a root of P*, where * denotes conjugation, and by P*, I mean the polynomial where you replace the coeffs with their conjugates. (You understand that (uv)*=u*v*?)
 
It does get mentioned along with FTA but i wouldn't bet on it having some special name.

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