Question

x^28=x

Answer 1

\(x^{28}=x\)

\(x^{27}.x-x=0\)

\(x^{27}.\left(x-1\right)=0\)

\(\orbr{\begin{cases}x-1=0\\x^{27}=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=1\\x=0\end{cases}}\)

Vậy x=1 hoặc x=0

Answer 2

\(x^{28}=x\)

\(x^{28}-x=0\)

\(x^{27}.x-x=0\)

\(x\left(x^{27}-1\right)=0\)

\(\orbr{\begin{cases}x=0\\x^{27}-1=0\end{cases}}\)

\(\orbr{\begin{cases}x=0\\x^{27}=1\Rightarrow x=1\end{cases}}\)