Question

let f(x)=x+5 and g(x) = x^2. Find (g f)(4)

Answer 1

Possible answers:
9
81
20
1

Answer 2

f(4) = 4 + 5 = 9;
g(f(4)) = g(9) = 9^2 = 81.

I think that is all there is to this problem, but the remember that (g f)(4) is not the same as (f g)(4).

Answer 3

thanks!