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Question-148155




Question Number 148155 by Khalmohmmad last updated on 25/Jul/21
Answered by Rasheed.Sindhi last updated on 26/Jul/21
x+(1/x)=−1⇒x^2 +x+1=0  x=ω,ω^2   x=ω  x^(1400) +x^(1363) +x^(37)   =ω^(1400) +ω^(1363) +ω^(37)   =ω^(1400 mod 3) +ω^(1363 mod 3) +ω^(37 mod 3)   =ω^2 +ω+ω=−1+ω  x=ω^2   =(ω^2 )^2 +ω^2 +ω^2   =ω.ω^3 +ω^2 +ω^2   =ω+ω^2 +ω^2   =−1+ω^2
$${x}+\frac{\mathrm{1}}{{x}}=−\mathrm{1}\Rightarrow{x}^{\mathrm{2}} +{x}+\mathrm{1}=\mathrm{0} \\ $$$${x}=\omega,\omega^{\mathrm{2}} \\ $$$${x}=\omega \\ $$$${x}^{\mathrm{1400}} +{x}^{\mathrm{1363}} +{x}^{\mathrm{37}} \\ $$$$=\omega^{\mathrm{1400}} +\omega^{\mathrm{1363}} +\omega^{\mathrm{37}} \\ $$$$=\omega^{\mathrm{1400}\:{mod}\:\mathrm{3}} +\omega^{\mathrm{1363}\:{mod}\:\mathrm{3}} +\omega^{\mathrm{37}\:{mod}\:\mathrm{3}} \\ $$$$=\omega^{\mathrm{2}} +\omega+\omega=−\mathrm{1}+\omega \\ $$$${x}=\omega^{\mathrm{2}} \\ $$$$=\left(\omega^{\mathrm{2}} \right)^{\mathrm{2}} +\omega^{\mathrm{2}} +\omega^{\mathrm{2}} \\ $$$$=\omega.\omega^{\mathrm{3}} +\omega^{\mathrm{2}} +\omega^{\mathrm{2}} \\ $$$$=\omega+\omega^{\mathrm{2}} +\omega^{\mathrm{2}} \\ $$$$=−\mathrm{1}+\omega^{\mathrm{2}} \\ $$

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