diketahui f(x) = {(1,3), (2,2), (3.1), (4,4)} dan g(x) = {(1,4), (2,3), (3,2), (4,1)} tentukan : a. gof b. fog c. gof (2) d. fof

jawab

a) gof

f.......g
1,3 --> 3.2
2,2 --> 2,3
3,1 --> 1,4
4,4,--> 4,1 
gof (x)= (1,2), (2,3),(3,4),(4,1)

b. fog
g.....f
1,4 --> 4,4,
2,3 --> 3,1
3,2 --> 2,2
4,1---> 1.3
fog(x) = (1.4),(2,1),(3,2),(4,3)

cgof(2)
f(2) = 2 --> g(2) = 3 --> gof(2) = 3

d. fof
(1,3),--> (31)
(2,2)---> (2,2)
(3,1) --> (1,3)
(4,4)--> (4,4)
fof  = (1,1), (2,2), (3,3), (4,4)