Question 319046
Use x,y format.
{{{y=(x+1)/(x+3)}}}
Now interchange x and y and solve for y.
This new y will be the inverse function.
{{{highlight(x)=(highlight(y)+1)/(highlight(y)+3)}}}
{{{x(y+3)=y+1}}}
{{{xy+3x=y+1}}}
{{{xy-y=1-3x}}}
{{{y(x-1)=1-3x}}}
{{{y=(1-3x)/(x-1)}}}
{{{highlight(f^(1)=(-3x+1)/(x-1))}}}