F (x) = 3x-7 g (x) = 5-2x tentukan fog (x) dan gof (x)

F (x) = 3x-7

g (x) = 5-2x

tentukan fog (x)

= f(g(x))

= f(5 – 2x)

= 3(5 – 2x) – 7

= 15 – 6x – 7

= 8 – 6x

Dan gof (x)

= g(f(x))

= g (3x – 7)

= 5 – 2(3x – 7)

= 5 – 6x + 14

= 19 – 6x