It seems like you've provided f(8), but I need to know the context or the specific function $f(x)$ that you're referring to. For instance, is $f(x) = 2x + 3$ or some other function?

Could you provide the complete function definition?

If you want to explore further, here are some relative questions:

1. What is the function $f(x)$ you want to evaluate at $x = 8$?
2. Are there any specific properties or constraints on $f(x)$?
3. Is the function linear, quadratic, or another type?
4. Are you looking to differentiate or integrate the function instead?
5. Do you have a graph or any additional information related to $f(x)$?

Tip: Always define a function explicitly when asking for an evaluation to avoid ambiguity.