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Homework Help: A really dumb math question

  1. Sep 21, 2012 #1
    1. The problem statement, all variables and given/known data
    Ok, so I have a=2bc^3 and b= c/f but I want to get rid of the b's.

    2. Relevant equations

    So I know I do a=2(c/f)c^3

    3. The attempt at a solution

    This is where I get lost (and feel stupid). Does this get simplified to (2c^4)/f? Or, is does it stay the same because the (c/f) is in brackets. I have to differentiate after, which is in itself another problem.
  2. jcsd
  3. Sep 21, 2012 #2


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    Staff: Mentor

    The bolded answer is correct. c * c^3 = c^4
  4. Sep 21, 2012 #3
    Booya! Thank you, berkeman!
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