Pembahasan :
fog = f(g(x))
= f (3x/2 -1)
= 3x-1
_____ + 5
2
= 3x – 1 + 10
___________
2
y = 3x + 9
______
2
2y = 3x + 9
2y – 9 = 3x
2y -9
____ = x
3
(fog)⁻1(x) = 2x – 9
_______
3
15. f (x) = 2x – 8 dan g(x) = x/2 + 1
nilai (fog)⁻1(1) = g(x) x/2 + 2
pembahasan :
fog = f(g(x))
= f(x/2+2)
= 2(x/2 + 2) – 8
y = x – 6
y + 6 = x
fog⁻1 (x) = x + 6
= 1 + 6
= 7