Answer:
[tex]{ \tt{f(x) = \frac{ {x}^{2} + 5 }{x} }} \\ [/tex]
• when x is (-x):
[tex]{ \tt{f( - x) = \frac{ {( - x)}^{2} + 5 }{ - x} }} \\ \\ { \tt{f( - x) = \frac{ {x}^{2} + 5 }{ - x} }} \\ \\ { \boxed{ \rm{ \: f( - x) = \frac{ {}^{ - } ( {x}^{2} + 5) }{x} \: }}}[/tex]