Find the inverse of the function f(x)=(34)x\displaystyle {f{{\left({x}\right)}}}={\left(\frac{{3}}{{4}}\right)}^{{x}} .

f1(x)=\displaystyle {{f}^{{-{{1}}}}{\left({x}\right)}}=   

The domain of f1\displaystyle {f}^{{-{{1}}}}  is