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November 2nd, 2009, 04:38 PM   #1
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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 ).

10-8eł(1) wrong

Find f''( x ).


Find f''( 1 ).
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November 2nd, 2009, 04:53 PM   #2
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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?
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November 3rd, 2009, 07:46 AM   #3
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Re: determine f'( x )

Mattpi means 2* x^5 - 8*e^x for example.
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