My Math Forum determine f'( x )

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 November 2nd, 2009, 04:38 PM #1 Newbie   Joined: Nov 2009 Posts: 1 Thanks: 0 determine f'( x ) can someone explain to me how to do these, i tried the first 2 and it kept giving me wrong( online system) If f(x) = 2 x^{5} - 8 e^x, determine f'( x ). 10x^4 - 8e^x wrong Find f'( 1 ). 10-8eˆ(1) wrong Find f''( x ). Find f''( 1 ).
 November 2nd, 2009, 04:53 PM #2 Senior Member   Joined: May 2008 From: York, UK Posts: 1,300 Thanks: 0 Your answers are right - are you sure you are inputting them in a way the online system can understand? Do you need to put explicit multiplication signs in, for example?
 November 3rd, 2009, 07:46 AM #3 Senior Member   Joined: Mar 2007 Posts: 428 Thanks: 0 Re: determine f'( x ) Mattpi means 2* x^5 - 8*e^x for example.

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