Let us take the functions f(x) = x + 1 and g(x) = 3x to illustrate how to find f(g(x)) when f(x) and g(x) are given.
f(g(x))
as g(x) = 3x
=> f(3x)
use f(x) = x + 1
=> 3x + 1
For x = c = 2
f(g(2)) = 3*2 + 1 = 6 + 1 = 7
f(g(2)) = 7
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