If f(x) = 3x+5/x , what is f(a+2)?

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We have the following funtion:
[tex]f(x)= \mathrm{3x+\dfrac{5}{x} }[/tex]
when the variable "x" is equal a (a+2)
[tex]f(x=(a+2))=\mathrm{3(x=(a+2))+\dfrac{5}{(x=(a+2))} }[/tex]
[tex]f(a+2)=\mathrm{3(a+2)+\dfrac{5}{(a+2)} }[/tex]
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