It seems you mentioned a function $f(x)$, but the specific function expression is missing. To find the value of the function $f(x)$ at $x = 5$, I'll need the equation or the rule that defines $f(x)$.

Could you please provide the function $f(x)$ so I can help you calculate the value at $x = 5$?

Would you like more details or have any questions?

Here are 5 related questions:

1. How do you evaluate a function at a given point?
2. What is the difference between evaluating a function and solving an equation?
3. What does it mean for a function to be defined at a certain point?
4. How can you determine if a function is continuous at a given point?
5. What is the importance of the domain when evaluating a function?

Tip: Always ensure the value you're substituting into the function is within the domain of the function to avoid undefined expressions.