Question 838761
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
f(x) = 3x; g(x) = {{{highlight(4x^2 + 1)}}} 
Substitute highlighted in for x in f(x) = 3x
(fog)(x) = 3{{{highlight(4x^2 + 1)}}} = 12x^2 + 3