\(ĐK:x\ge-1\)
\(PT\Leftrightarrow\left(x+1\right)\left(x^2+1\right)=1\) ( Bình hương hai vế không âm )
\(\Leftrightarrow x^3+x^2+x+1=1\)
\(\Leftrightarrow x\left(x^2+x+1\right)=0\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x^2+x+1=0\end{array}\right.\)( vô lí )
Vậy \(x=0\)