To find: (f o g) (7)

Formula used: f o g = f(g(x))

Given: (i) f (x) = x + 7

(ii) g (x) = x – 7

We have,

f o g = f(g(x)) = f(x – 7) = [ (x – 7) + 7 ]

⇒ x

(f o g) (x) = x

(f o g) (7) = 7

Ans). (f o g) (7) = 7