Question

If f(x) = 5x − 3, which expression represents its inverse function?

Answer 1

By defnition, the inverse function of a given fuction \(f(b)\) whose image is for example "a".
The inverse function of f(x) will be the function where f(a) is then "b".
Then:
\[f(b)=a \rightarrow f ^{-1}(x) \iff f^{-1}(a)=b\]