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 10-03-2010, 10:51 AM #1 Junior Member   Join Date: Jan 2006 Posts: 38 Math Functions Question Eg. If f(7x + 5) = 14x + 10 for all real x, what is f(x)? Sparknotes gives the following explanation: To discover what f(x) is, look where f maps 7x + 5. Simply put, f doubles the input: f(7x + 5) = 2 (7x + 5). Therefore, f(x) = 2x for all x. But what if it is a more complicated function? Is there a more reliable way of getting the answer? Reply
 10-03-2010, 11:08 AM #2 Junior Member   Join Date: May 2010 Posts: 109 Backsolve. Reply
 10-03-2010, 12:23 PM #3 Junior Member   Join Date: Aug 2010 Posts: 148 lol i just did that saame practice test awhile ago haha, ran out of time though Reply
 10-06-2010, 08:13 AM #4 Junior Member   Join Date: Jan 2006 Posts: 38 can someone explain how to backsolve it? thanks! Reply

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