Question 1128775
g(x)=4lnx +1 g<sup>-1</sup>(ln 81+1)= ? If we let the unknown be y, we get this:

{{{g^-1(ln 81 +1)=y}}} Using the definition of an inverse, we can rearrange the equation to make it look like this:

{{{g(y)=ln 81+1}}} 4lny+1=ln 81+1 

4lny=ln 81

4lny=4ln 3

lny=ln 3

{{{highlight(y=3)}}}