Question

Please Help - Let f(x)=x−1/x+1.

Answer 1

$\\ \sf\longmapsto f(x)=\dfrac{x-1}{x+1}$

• Inverse it

$\\ \sf\longmapsto f^{-1}(x)=\dfrac{1}{f(x)}=\dfrac{x+1}{x-1}$

#1

$\\ \sf\longmapsto f^{-1}(3)=\dfrac{3+1}{3-1}=\dfrac{4}{2}=2$

#2

$\\ \sf\longmapsto f^{-1}(3)$