NEED HELP WITH THIS!!!

Question

anonymous · Answer

Given the function f(x) = log3(x + 4), find the value of f−1(3).

anonymous · Answer

https://mathway.com/

anonymous · Answer

The website doesn't show this at all..

anonymous · Answer

Well f-1 isnt it I hate f-1
however,  basically they ask you to do this
y = log3(x+4) and make x the subject. 
3^y = x+4
hence 3^y-4 = x
now switch the x and y, you get 
(3^x) - 4 = f(x) 
Now plug the value, 3
so you ahve 27-4 = 23
Im doing this inverse thing for logs for the first time so i might be wrong but im pretty confident about it haha

anonymous · Answer

oh cool, thanks! Yea, these are new to me too, so its pretty confusing now.lol

anonymous · Answer

Haha... alwayss remember inverse functions want you to make x the subject in any way possible, and then switch the x and y :P