Jika diketahui f(x)=x-1 dan g(x) =x²-7 tnentukan (f o g)3

f(x) = x – 1

g(x) = x² – 7

penyelesaian :

(fog)(x) = f(g(x))

           = f(x² – 7)

           = x² – 7 – 1

(fog)(x) = x² – 8

(fog)(3) = 3² – 8

            = 9 – 8

(fog)(3) = 1