Question

If fg(x) = 2x + 1, and f(x) = x + 2, find g(5) and g-'f'(1).​

Answer 1

g(5) - f(1) = 8

g(5) = 11

Explanation:

Given:

g(x) = 2x + 1

f(x) = x + 2

Find:

g(5)

g(5) - f(1)

Computation:

g(x) = 2x + 1

g(5) = 2(5) + 1

g(5) = 11

f(x) = x + 2

f(1) = 1 + 2

f(1) = 3

g(5) - f(1) =11 - 3

g(5) - f(1) = 8