Fungsi f(x)=6x-3,g(x)= 5x+4, dan (fog) (a) =81. Nilai a=

Fungsi Komposisi


f(g(x))
= 6(5x+4) - 3
= 30x + 24- 3
= 30x + 21

f(g(a)) =81
30a + 21 = 81
30a =60
a = 2

(fog)(x)=6(5x+4)-3=30x+24-3=30x+21
(fog)(a)=81
30a+21=81
30a=81-21
30a=60
a=60/30
a=2
jadi nilai a adalalah 2