Answer :

To understand the opposite of a function, let's start with the definition.

Given a function [tex]\( g(x) \)[/tex], the opposite of this function refers to its negation.

1. The original function is [tex]\( g(x) \)[/tex].
2. To find the opposite (or the negation) of the function, you simply multiply the entire function by [tex]\(-1\)[/tex].
3. Thus, the negation of [tex]\( g(x) \)[/tex] would be:
[tex]\[ -g(x) \][/tex]

So, if you are asked to find what [tex]\( -g(x) \)[/tex] equals when referring to the negation of [tex]\( g(x) \)[/tex], it logically follows from the definition of negation that:
[tex]\[ -g(x) = -g(x) \][/tex]

The expression is indeed self-explanatory and stands as it is. Therefore, the solution is:
[tex]\[ \boxed{-g(x) = -g(x)} \][/tex]

This reflects that the negation of the function remains the same when expressed in terms of [tex]\( -g(x) \)[/tex].