\(\left(x+2\right)^3=\left(x+2\right)\)
\(\Rightarrow\left(x+2\right)^3-\left(x+2\right)=0\)
\(\Rightarrow\left(x+2\right).\left[\left(x+2\right)^2-1\right]=0\)
\(\Rightarrow\left[{}\begin{matrix}x+2=0\\\left(x+2\right)^2-1=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-2\\\left(x+2\right)^2=1\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-2\\x+2\in\left\{-1;1\right\}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-2\\x=-3\\x=-1\end{matrix}\right.\)
Vậy............
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