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f(g(x)) means that you must calculate g(x) and then put the result into f(x). For example, suppose f(x)=log(x) and g(x)=3x + 5. Then f(g(x))=log(3x+5). Does it sound more clear, now? You put g(x) everywhere you see x in the expression of f(x), to say it brutally
Mmmm, almost got it. g(x) = 2x, so you should put (2x) instead of x (in the expression of f(x)), with the parentheses, to be sure not to do distraction mistakes
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would my answer be 2x^2+2?
Remember not to forget the parentheses, they're fundamental!
Also, the " +1 " in the expression of f(x) does not contain x, so you don't have to change it, it remains " + 1". Try again, now you will get it!
Actually, the answer is 4 x^2 + 1, or (2x)^2 + 1. Those damn parentheses may change the result and mislead you! I hope to have been helpful :D
(remember the parentheses!!!)