F (x) = x+4 g (x) = 4x-1 tentukan a. (g o f) (x) (g o f) b. (f o g) (x) c. (f o g) (3)

a. (g o f) (x)
= g(f(x))
= g(x + 4)
= 4(x + 4) - 1
= 4x + 16 - 1 = 4x + 15

b. (f o g) (x) 
= f(g(x))
= f(4x - 1)
= 4x - 1 + 4 = 4x + 3

c. (f o g) (3) 
= 4x + 3 = 4.3 + 3 = 15

maaf kalau ada yang salah

a. (g o f) (x)
b. (f o g) (x)
c. (f o g) (3)

jwb :
a. (g o f) = g (f(x))
   = g  (x + 4)
= 4x - 1
= 4 (x + 4) -1
= 4x + 16 - 1
= 4x + 15

b. (f o g) = f (g(x))
= f (4x - 1)
= x + 4
= x(4x - 1) + 4
= 4x^2 - x + 4


yg c aku kurang mengerti, maaf ya :)
semoga bermanfaat