I am having a bit of trouble with communicating information about functions in English. I know that $f(x)$ is read $f$ of $x$, but how would I use this in a sentence? Say, we have a argument x=5, and I want to express the process of passing this input to the function, would I then say:
- taking $f$ of 5 gives $f(5) = 5^2+1$,
- putting the argument $x=5$ gives $f(5) = 5^2+1$ (this seems ambiguous if multiple functions exists), or
- putting $x=5$ and applying function $f$ gives $f(5) = 5^2+1$?
I suspect that the first option is correct, but English is not my native language and I'd love some feedback on this.