If f (x) = 7x and g (x) = 3x+1, find (fºg) (x).

21x+7

The value of (fog) (x) is, 21x+7

Step-by-step explanation:

Given the functions:

f (x) = 7x

g (x) = 3x+1

We have to find (fog) (x)

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

substitute the function g (x) we have;

(fog) (x) = f (3x+1)

Replace the value of x from 3x+1 in f (x) we have;

(fog) (x) = 7 (3x+1)

⇒ (fog) (x) = 21x+7

Therefore, the value of (fog) (x) is, 21x+7