calculus help plz!! if f(x)= (2e^x -8)/(10e^x + 9) then wat is f^(-1)(x)? i first took the ln of both sides.... getting lny = ln (2e^x - 8)/(10e^x + 9) then using one of the properties i get lny = ln (2e^x - 8) - ln (10e^x + 9) and from here i get stuck...how do i solve for x?? am i doing it a totally wrong way?? plz help!!!!!