Toán Lớp 8: Tìm x:
x^5 + x^4 + x^3 + x^2 + x +1= 0
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Toán Lớp 8: Tìm x:
x^5 + x^4 + x^3 + x^2 + x +1= 0
Comments ( 2 )
⇔ $x^{4}$(x + 1) + $x^{2}$(x + 1) + (x + 1) = 0
⇔ (x + 1).($x^{4}$ + $x^{2}$ + 1) = 0
⇒\(\left[ \begin{array}{l}x + 1 = 0\\x^{4} + x^{2} + 1\end{array} \right.\) ⇔ \(\left[ \begin{array}{l}x=-1\\x∈∅\end{array} \right.\)