$f(x) = \frac{{x - 5}}{{{x^2} - 9}} + \sqrt[4]{{2x - 4}}$ ، دامنه $f(x)$ کدام است؟
$\,\left[ {2\,,\,\infty } \right)\, - \left\{ 3 \right\}$
2 )
$\left[ { - 2\,,3} \right)$
3 )
$\left( {3\,,\,\infty } \right)$
4 )
$\left( { - \infty \,,\,\infty } \right)$