It looks like you're asking for the values of a function $f(x)$ at specific points, but I need the definition of the function to proceed. Could you provide the equation or rule for $f(x)$?

For example, if $f(x) = 2x + 3$, then:
$f(2) = 2(2) + 3 = 4 + 3 = 7$ $f(4) = 2(4) + 3 = 8 + 3 = 11$

Let me know the function, and I'll find the values for you!

Related Questions:

1. What is the function $f(x)$ in your problem?
2. Are you working with a linear, quadratic, or another type of function?
3. Do you need help graphing $f(x)$ along with these values?
4. Would you like to evaluate $f(x)$ at other points as well?
5. Are you looking for a general method to evaluate functions?

Tip:

When evaluating functions, substitute the given input value into the function equation and simplify step by step.