1) Find Inverse, f(x) = 2x / (x+1)
2) and write as single logarithm: log4(x-3) + log4(x+3) -5log4(x^2-6)
rewrite as y = 2x / (x+1)
switch x and y to get x = 2y / (y+1)
(y+1)x = ...
An inverse is found and an expression written as a single logarithm.