misalkan fungsi komposisi (fog) (x)=4-2x dan fungsi g(x)=6x+1 carilah fungsi f(x)

jawab
fungsi

g(x) = 6x + 1
fog(x) =  4 - 2x
f{g(x)} =  4 - 2x
f(6x +1) = 4 - 2x
a= 6x + 1
6x = a - 1
x = 1/6 (a - 1)
f(a) = 4 - 2 (1/6(a -1))
f(x) = 4 - 1/3 (x - 1)
f(x) = 4 - 1/3 x + 1/3
f(x)= 1/3 (12 -x + 1)
f(x) =1/3 (13 - x)