Express the following using inverse notation:

(2)/(n+3)

Now, I tried the problem treating it as a function, placing f(x)= in front of the equation. I solved it as I normally would to come out with the answer:

f^(-1)(x)=-3+(2)/(n)

But to my suprise, it was wrong. I double, triple, even quadruple checked, but every time it still came out as incorrect.

This problem is part of a practice test, so I looked up the answer, to be:

2(n+1)^(-1)

I understand what they're asking for, just have no clue how to figure it thru. Any help is appreciated. If you have any questions, please feel free to ask. Thank you ahead of time!