Wait it's okay, I got it! I wasn't adding the 1 to the (1 + x) properly!

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- Jul 9th 2010, 09:06 PM #1

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## f(f(x))

The question is:

Let f(x) = 1/(1 + x). What is:

(i) f(f(x))

I think it's supposed to be f(f(x)) = 1/[1+(1/(1 + x))]

But the answers say that it's (x + 1)/(x + 2)

If I re-arrange the equation, the best I can get is (x + 1)/2, where does the extra x come from (if I'm even doing it right at all in the first place)?

- Jul 9th 2010, 09:09 PM #2

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- Mar 2010
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