$\begin{array}{l} \left| P \right| = P\\ \Leftrightarrow \left| {\dfrac{{\sqrt x }}{{\sqrt x - 2}}} \right| = \dfrac{{\sqrt x }}{{\sqrt x - 2}}\\ \Rightarrow \dfrac{{\sqrt x }}{{\sqrt x - 2}} > 0\\ \Leftrightarrow \left\{ \begin{array}{l} \sqrt x > 0\\ \sqrt x - 2 > 0 \end{array} \right. \Leftrightarrow \left\{ \begin{array}{l} x > 0\\ x > 4 \end{array} \right. \Rightarrow x > 4 \end{array}$
