\(\Leftrightarrow x^2+10-\dfrac{2x^2+1}{x^2-8}\le0\)
\(\Leftrightarrow\dfrac{x^4-81}{x^2-8}\le0\)
\(\Leftrightarrow\dfrac{\left(x-3\right)\left(x+3\right)\left(x^2+9\right)}{\left(x-2\sqrt{2}\right)\left(x+2\sqrt{2}\right)}\le0\)
\(\Rightarrow\left[{}\begin{matrix}-3\le x< -2\sqrt{2}\\2\sqrt{2}< x\le3\end{matrix}\right.\)