diket fungsi f(x)=6x-3, g(x)=5x+4, dan (f o g)(a)=81. nilai dari a adalah

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

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

fog (a) = 81
30a + 21 = 81
30a = 60
a = 60/30
a = 2

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

(f o g)(a) =81

30a+21=81
30a =81-21
30a =60
a =60/30
a =2