tolong ya dengan caranya no 2 dan 3

No 2
f(x) = 3x+1 / x-5
g(x) = x + 2 / 2x-3

A. nilai (fog) (x)
3g(x) + 1 / g(x) -5
3(x+2 / 2x-3) + 1 / (x+2 / 2x-3) - 5
(3x+6 + 2x-3 / 2x-3 ) bagi x+2 -5(2x-3) / 2x-3
[5x+3 / 2x-3] kali [2x-3 / -9x+17]
5x+3 / -9x+17

B. (fog)-¹(x) atau inversnya
y = 5x+3 / -9x+17
y(-9x+17)= 5x+3
-9xy+17y=5x+3
-9xy-5x = -17y+3
x(-9y-5)=-17y+3
x=-17y+3 / -9y-5
(fog)-¹(x) = 17x+3 / 9x+5