ĐK:\(x\ge0;x\ne16\)
\(\sqrt{P}>P\\ \Leftrightarrow\sqrt{P}-P>0\\ \Leftrightarrow\sqrt{P}\left(1-\sqrt{P}\right)>0\\ \Leftrightarrow1-\sqrt{P}>0\\ \Leftrightarrow\sqrt{P}< 1\\ \Leftrightarrow P< 1\\ \Leftrightarrow\dfrac{2}{\sqrt{x}-4}-1< 0\\ \Leftrightarrow\dfrac{2-\sqrt{x}+4}{\sqrt{x}-4}< 0\\ \Leftrightarrow\dfrac{6-\sqrt{x}}{\sqrt{x}-4}< 0\\ \Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}6-\sqrt{x}< 0\\\sqrt{x}-4>0\end{matrix}\right.\\\left\{{}\begin{matrix}6-\sqrt{x}>0\\\sqrt{x}-4< 0\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x>36\\x>16\end{matrix}\right.\\\left\{{}\begin{matrix}x< 36\\x< 16\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x>36\\0\le x< 16\end{matrix}\right.\)
