ĐKXĐ: \(x\ge-1\)
\(\Leftrightarrow\sqrt{\left(x+1\right)\left(x+2\right)}-\sqrt{x+2}-\sqrt{x+1}+1=0\)
\(\Leftrightarrow\sqrt{x+2}\left(\sqrt{x+1}-1\right)-\left(\sqrt{x+1}-1\right)=0\)
\(\Leftrightarrow\left(\sqrt{x+1}-1\right)\left(\sqrt{x+2}-1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}\sqrt{x+1}=1\\\sqrt{x+2}=1\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=0\\x=-1\end{matrix}\right.\)