jika g(x) =x^ - 1 dan fungsi (fog)(x) =x^4 maka f(4) =.....

(f • g)(x) =x^(4)
g(x) = x^(-1) = 1/x

cari dulu g^(-1) (x) = 1/x

Ingat, g(g^(-1)(x)) = x

= (fog)(x)
= f (g(x))
= f (g(g^(-1)(x)))
= [ (g^(-1)(x))^(-1) ]
= [ (1/x)^(-1) ]
= x = f(x)

f(4) = 4