Question

If f(x) = log3 (x + 1), what is f−1(2)?
@Salmon

Answer 1

f-1(x)=3^x -1
f-1(2)=3^2 -1=9-1=8

Answer 2

I get f-1(x) = 3^(x-1) -1 ? salmon can you double check?

Answer 3

\[y=\log_{3} (x+1)\]
converting to exponential form
\[3^y=(x+1)\]
\[3^y-1=x\]
so, \[f^{-1}(x)=x^3-1\]

Answer 4

@alekos I think salmon is wrong.