To find the value of a when f(5) = a, we need to know the function f and its corresponding equation or definition. Without knowing the specific function, it is not possible to determine the exact value of a.
For example, if the function f is defined as f(x) = 2x + 3, we can substitute 5 for x to find the value of a:
f(5) = 2(5) + 3
= 10 + 3
= 13
In this case, the value of a would be 13.
Therefore, without additional information about the function f, we cannot determine the exact value of a.