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Question Number 55059 by gunawan last updated on 17/Feb/19
Find the number of root equation  z^4 −5z+1=0 in 1 ≤ ∣z∣ ≤ 2
$$\mathrm{Find}\:\mathrm{the}\:\mathrm{number}\:\mathrm{of}\:\mathrm{root}\:\mathrm{equation} \\ $$$${z}^{\mathrm{4}} −\mathrm{5}{z}+\mathrm{1}=\mathrm{0}\:\mathrm{in}\:\mathrm{1}\:\leqslant\:\mid{z}\mid\:\leqslant\:\mathrm{2} \\ $$

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