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Math Help - power rule derivatives

  1. #1
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    power rule derivatives

    ok I've done this one but cant seem to get the right answer, what am i doing wrong?

    Find the derivative of the function below.


    i got...2x-7x^(-2)

    thanks
    Last edited by mer1988; September 24th 2007 at 08:12 PM. Reason: needed modifying
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by mer1988 View Post
    ok I've done this one but cant seem to get the right answer, what am i doing wrong?

    Find the derivative of the function below.


    thanks
    what problems are you having with changing these forms to forms with powers? if you don't understand the manipulations i or some other users do, it is in your best interest to ask. based on the problems you've received help with thus far, you should not be having a problem with this.

    h(x) = x^2 + \frac 1{7x} = x^2 + \frac 17x^{-1}

    now continue
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    Find the derivative of the function below. Assume that a and b are constants.


    alright, this one i thought i did it right, however it what wrong, i got 56ab^6q...what did i do wrong?
    Last edited by ThePerfectHacker; September 25th 2007 at 08:57 AM.
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  4. #4
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    Quote Originally Posted by mer1988 View Post
    Find the derivative of the function below. Assume that a and b are constants.


    alright, this one i thought i did it right, however it what wrong, i got 56ab^6q...what did i do wrong?
    If b is assumed constant, then why did you differentiate it? You cannot differentiate constants.

    w = (8ab^7)q
    dw/dq = 8ab^7

    If y = 3x
    What is dy/dx?
    Last edited by ThePerfectHacker; September 25th 2007 at 08:57 AM.
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  5. #5
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by mer1988 View Post
    alright, this one i thought i did it right, however it what wrong, i got 56ab^6q...what the did i do wrong?
    Please don't swear. We get 4th graders (and maybe some younger) here.

    -Dan
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