You have the following function given in the exercise:

And the other function is:

You need to remember that this means that you must subtract the function g(x) from the function f(x):

It can also be expressed as following:

Then, you can set up that:

In order to simplify, it is important to remember the Sign rules for Multiplication:

Then, you can distributive the negative sign:

Finally, you need to add the like terms (which are defined as those terms that have the same variables and the same exponents):

The answer is:
