There are no numbers for this, thus you will have to use the quadratic formula.
The answer is -6 sorry could not explain because have to go somewhere hope it helped
An inverse function is a function that reverses another function, so we have a function called:

Then, the inverse function will be as follows:

Given that

, we need to isolate x in terms of y:

∴

So:

and

therefore, exchanging variables x and y:

and


and

Which are the figures shown below.