Question 669683
Using
f(x) = x^2 + x
g(x) = 2x + 1
...
f(4) = 4^2 + 4
= 16 + 4
f(4) = {{{highlight_green(20)}}}
...
(fog)(2)
g(2) = 2(2) + 1
= 4 + 1 
= 5
(fog)(2) = 5^2 + 5
= 25 + 5
(fog)(2) = {{{highlight_green(30)}}}
.....................
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