Question

tìm x: x mũ 8 = x mũ 3

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Answer 1

\(x^8=x^3\)

\(\left[\begin{array}{nghiempt}x=0\\x=1\end{array}\right.\)

Answer 2

\(x^8=x^3\)
\(\Rightarrow x^8-x^3=0\)
\(x^5.x^3-x^3=0\)
\(x^3.\left(x^5-1\right)=0\)
Hoặc \(x^2=0\Rightarrow x=0\)
Hoặc \(x^{998}-1=0\Rightarrow x^{998=1}\Rightarrow x^{998}=1^{988}\Rightarrow x=1\)