diketahui fungsi f dan g ditanyakan dalam pasang terurut f= {(1,5) , (2,6) , (3,-1) , (4,8)} g= {(2,-1) , (1,2) , (5,3) , (6,7)} tentukanlah gof dan fog

jawab

gof(x)  = 

f(x) ---> g(x) = fog(x)
(1,5) -->(5,3  = (1,3)
(2,6) --> (6,7) = (2,7)
(3,-1) --> {} = (3, Ф)
pasang berurutan fog(x) = (1,3), (2,7), (3, Ф)

fog(x) = ...
g(x)  ---> f(x) = fog(x)
(2,-1) --> (-1, Ф) = (2, Ф)
(1,2) --> (2, -1) = (1 , -1)
(5,3) --> (3, -1) = (5, - 1)
(6,7) --> (7, Ф) = (6, Ф)
Pasang berurutan =(2,Ф), (1,-1), (5,-1), (6,Ф)