Rumus fungai f(x)=6x-2 dan g(x) =5x+4 jika fungsi (f¤g )(a) = 81 nilai a adalah

(fog)(x) = 6(5x+4) - 2
= 30x + 24 - 2
= 30x + 22

(fog) (a) = 30a + 22
81 = 30a + 22
30a = 81 - 22 = 59
a = 59/30 = 1,96