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Difference quotient (i know this is right) but it is telling me otherwise

  1. Sep 4, 2010 #1
    1. The problem statement, all variables and given/known data

    Given the function , calculate the following values f(x) = 2-5x

    3. The attempt at a solution

    f(a)= 2-5x
    f(a+h)= 2-5(x-h)
    f(a+h)-f(a)/h = -5

    i am 100% sure but the darn computer is telling me that f(a) and f(a+h) is wrong.
    my calc professor is using webwork which is super stupid. it is telling me : " Variable 'x' is not defined in this context" how am i suppose to put in the answer if i already have it?
    i emailed my professor, but she was unhelpful stating something totally unrelated, and it is due tomorrow i need help please
  2. jcsd
  3. Sep 4, 2010 #2
    never mind i got it.

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