ĐKXĐ: \(-2\le x\le2\)
\(\Leftrightarrow\sqrt{x+2}=2+4\sqrt{2-x}\)
Do \(x\le2\Rightarrow\sqrt{x+2}\le\sqrt{2+2}=2\Rightarrow VT\le2\)
\(4\sqrt{2-x}\ge0\Rightarrow VP\ge2\Rightarrow VP\ge VT\)
Dấu "=" xảy ra khi và chỉ khi:
\(\left\{{}\begin{matrix}\sqrt{x+2}=2\\4\sqrt{2-x}=0\end{matrix}\right.\) \(\Leftrightarrow x=2\)