tolong dijawab ya..

f o g (x) = f( g(x) )

= 2(1/(3x+1)) - 3
= (2 - 3(3x +1)) / (3x+1)
= (-9x -1) / (3x + 1)

jika fog (x) = (ax + b)/(cx + d)
maka fog -'(x) = (dx - b)/(-cx + a)

sehingga fog-'(x) = (x + 1)/(-3x - 9)
= - (x + 1)/(3x + 9)

jawaban (a)

semoga jelas dan membantu