I got the question f '(x) given:
f(x) = ln((8x+3)/(5x+8))

Now i first used quotient rule for inside bit and got:

(5x+8*8 - 8x+3*5) / (5x+8)^2

Now to use the chain rule for ln((8x+3)/(5x+8)) i am not sure, could someone help please?