Answer
$f^{-1}(8)=3$
Work Step by Step
By definition, if $f(3)=8$, $f^{-1}(8)$ must equal 3 for it to be a one to one function. (Note, that the difference between the function and its inverse is that the x and y values are switched.)
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.