I have equations as follows $$f(f(x))=x^2+x$$ Then solve for $f(x)$. Can anyone give some hints about this question?
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2I believe this is a duplicate of a very recent question. – hrkrshnn Aug 29 '14 at 14:51
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On what set is it supposed to be true? – Jean-Claude Arbaut Aug 29 '14 at 14:51
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3Gotcha! http://math.stackexchange.com/questions/911818/how-to-get-fx-if-we-know-ffx-x2x – hrkrshnn Aug 29 '14 at 14:52
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2Probably homework from a class if it was asked twice in two days. – Joel Aug 29 '14 at 14:53
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Three times, actually. There is another question from yesterday that was closed as a duplicate as well. – rogerl Aug 29 '14 at 14:54
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I saw this question from websites and tried to solve it, but I failed. So I come here to ask for help. – Bowen Aug 29 '14 at 15:04
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1@sdg Out of curiosity, which website? – Jean-Claude Arbaut Aug 29 '14 at 15:06
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@Jean-Claude Arbaut I don't remember what the website is exactly. But one of my friends also asked me the same question yesterday. He said he saw that from a website, too. But he didn't tell me which it was. – Bowen Aug 29 '14 at 15:12