Question

Let f(x) = -4x + 7 and g(x) = 10x - 6, find f(g(x)).

Answer 1

That means plug in g(x) into f(x) where ever there is an x, so..
\[\LARGE f(g(x))=-4(10x-6)+7\]
Finish it~

Answer 2

f(g(x)) also means fog, you know the stuff in the sky. XD

jk :P