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For this case we have that by definition, if we want to find (f o g) (x) we must replace g (x) in f (x), on the contrary, if we want to find (g o f) (x) we must replace f (x) in the function g (x).

So:

Thus, the expression that is equal to (f o g) (x) is, or 20x (to the second power) - 1

Option A

20x (to the second power) - 1

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