Question

Given that f(x) = 2x + 5 and g(x) = x − 7, solve for f(g(x)) when x = −3.

Answer 1

first substitue x=-3 in g(x)
the value that you find for g(x), substitute that value in f(x)

value = g(-3) = -3-7
f(g(x))= f(value) = 2(value)+5