If f(x)=log3(x2−1)f(x) = \log_3(x^2 - 1)f(x)=log3(x2−1), what is the inverse function f−1(x)f^{-1}(x)f−1(x)?
f−1(x)=3x+1f^{-1}(x) = \sqrt{3^x + 1}f−1(x)=3x+1
f−1(x)=3x/2+1f^{-1}(x) = 3^{x/2} + 1f−1(x)=3x/2+1
f−1(x)=3x−1f^{-1}(x) = \sqrt{3^x - 1}f−1(x)=3x−1
f−1(x)=ln(3x+1)f^{-1}(x) = \ln(3^x + 1)f−1(x)=ln(3x+1)