Answer:


Step-by-step explanation:
Remember that for two functions to be inverses, the following must be true:

Since we know they <em>are </em>indeed inverses, they are true.
So, whatever input we put in, we'll just get it back out again.
So, for our first problem:

We can rewrite this as:

We can imagine our x being 3 here.
Therefore, using the above identity, we can conclude that:

For our second example, the same thing:

This is the same as saying:

Again, using the above property, we can imagine our x is -4b. So, this will be equivalent to:

And we're done!