The expression $(f + g)(x)$ represents the sum of two functions $f(x)$ and $g(x)$. Specifically, it's defined as:

$(f + g)(x) = f(x) + g(x)$

This means you add the outputs of $f(x)$ and $g(x)$ for a given value of $x$. If you have explicit forms of $f(x)$ and $g(x)$, you can directly add them together.

Would you like to provide the functions $f(x)$ and $g(x)$ for a more detailed solution?

Here are 5 related questions that you might find useful:

1. What happens if $f(x)$ or $g(x)$ are polynomials?
2. How does the operation change if $f(x)$ and $g(x)$ are trigonometric functions?
3. Can $f(x)$ and $g(x)$ be defined piecewise? How would their sum behave then?
4. What is the domain of the function $(f+g)(x)$?
5. How does this operation differ from function multiplication, $(f \cdot g)(x)$?

Tip: When adding functions, make sure to consider their domains, as the domain of $(f + g)(x)$ will be the intersection of the domains of $f(x)$ and $g(x)$.