Tolong bantu jawab dong

3. f(x) = 3x + 5
g(x) = 2x/x+1
(gof)(x) = 2(3x+5)/3x+5+1 = 6x+10/3x+6

4. f(x) = 3x - 5
g(x) = x-1/2-x
(gof)(x) = 3x-5-1/2-(3x-5)= 3x-6/7-3x

5. f(x) = x+1/x-3
g(x) = x^2+x+1
f(2) = x+1/x-3 = 2+1/2-3 = 3/-1 = -3
(gof)(2) = x^2+x+1 = (-3)^2+(-3)+1 = 9-3+1 = 7

6. f(x) = 2x+p
g(x) = 3x + 120
g(f(x)) = f(g(x))
3(2x+p) + 120 = 2(3x+120) + p
6x + 3p + 120 = 6x + 240 + p
6x-6x + 3p - p = 240 - 120
2p = 120
p = 120/2
p = 60