Jika f (X – 1 ) = 3X dan g (4 – X ) = X , maka nilai f (g(0) – g(f(2) ) sama dengan …..

f (g(0) – g(f(2) ) sama dengan …..

30

pembahasan :

y = x –1

x = y + 1

f (X – 1 ) = 3X

f(y) = 3(y +-1)

f(y) = 3y + 3

y = 4 – x

x = 4 – y

g (4 – X ) = X

g(y) = 4 – y

g(0) = 4 – 0 = 4

f(2) = 3(2) + 3 = 9

g(f(2)) = 4 – 9 = –5

g(0) – g(f(2)) = 4 – –5 = 9

f (g(0) – g(f(2) ) = f(9)

= 3(9) + 3

= 30