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Math Help - f(x) to f'(x) help

  1. #1
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    f(x) to f'(x) help

    Hey guys! I have a problem. the following picture shows a question on a test i had. I understand how to do part i) and part ii), but I'm not sure how to do part iii). specifically, i don't understand how they got from n(x) to N'(x)



    i understand how they went from 100x - 100x^4 to 100(4)x^3 but what happened to the 2000?
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  2. #2
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    The derivative of a constant is zero.
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  3. #3
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    Our lecturer urged us to do mental gymnastics. "In the morning, pick a constant", he would say, "and differentiate it. Next day, pick a bigger constant".
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