Mathematics for IGCSE & O level - Functions (Section 1 - No. 8)
Which of the following is true about the composite function g(f(x))?
You apply the function f(x) first.
The input for the function g is the output from f(x).
The output from f(x) is the domain for g(x).
The range of f(x) is the domain for g(x).
Explication
g(f(x)) follows the f then g order, and the range of the inner function (f(x)) becomes the domain of the outer function (g(x)).