What is the inverse of the function 3+9

Question

3+x²⁺⁹

Answer 1

The title you submitted is incorrect.

 

Assuming f(x) = 3+x²⁺⁹ to be a function, I have to ask why the exponent was not written as 11.  I suspect that you may want to clarify just what the function is, because of the 'suspect' way it has been presented.