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Math Help - Equation order 8 in C :

  1. #1
    Super Member dhiab's Avatar
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    Equation order 8 in C :

    Solve in R :
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  2. #2
    Moo
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    Quote Originally Posted by dhiab View Post
    Solve in R :
    z^8-z^6=z^6(z^2-1)

    So z^8-z^6-z^2+1=(z^2-1)(z^6-1)=(z-1)(z+1)(z^3-1)(z^3+1)
    =(z-1)^2(z+1)^2(z^2+z+1)(z^2-z+1)
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  3. #3
    Super Member malaygoel's Avatar
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    Quote Originally Posted by dhiab View Post
    Solve in R :
    z^8-z^6+z^2-1=0

    (z^6+1)(z^2-1)=0

    now, it can be solved using Demoivres theorem.
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