let f(x)= 2x+8 and g(x)= x+4 (f+g)(x)

Except for the very first one you posted, these are all pretty much the same. The very first one had f ( g(x) ) You had to take a function of a function. The rest of these seem to be simple additions, subtractions, multiplications, or divisions. Here just add f(x) to g(x) to get (f+g)(x)

oo duh. lol thank you!

Perhaps this might help Say f(x) = x^2 and g(x)=x^3 then f(x)g(x) = x^(2+3) = x^5 BUT f(g(x)) = (x^3)^2 = x^6

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