Jake H.

asked • 07/19/20

Is ff(x) the same as f^2(x)

1 Expert Answer

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Jeffrey K. answered • 08/11/20

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Jake, the answer is No!


f(f(x)) means replace each x in f(x) by the entire function f(x).

For example, if f(x) = x3 + 13x + 9, then f(f(x)) = (x3 + 13x + 9)3 + 13(x3 + 13x + 9) + 9


However, f2(x) would mean (f(x))2 so, in the above example, f2(x) = (x3 + 13x + 9)2

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