The answer is (E).
COMPOUND FUNCTIONS
The letter f is not the only letter used to designate a function, though it’s the
most popular. Second in popularity is the letter g, which is generally used in a
question that includes two different functions.
COMPOUND FUNCTIONS
f(g(x)) means apply g first and then apply f to the result.g(f(x)) means apply f first and then apply g to the result.f(x)g(x) means apply f and g separately and then multiply the results.Take a look at Example 2:1. If what is the value of f(g(2))?