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Math Help - Find the derivative of...

  1. #1
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    May 2009
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    Find the derivative of...

    Find the derivative of...

    10x^9-6x^4+5/x^3-8x^6-10/x^6

    for this I got the following...(am I right?)

    -90x^8-48x^5-24x^3-12/x^4+60/x^7

    my next questions is find the derivative of...

    x^3/8x^8-7x^5+1

    for this i decided I need to use the quotient rule? (am i right in doing so?)

    after doing the quotient rule I got this...(am I right?)

    dy/dx=8x^8-7x^5+1*3x^2-x^3*64x^7-35x^4/(8x^8-7x^5+1)^2

    thanks
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  2. #2
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    Nov 2009
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    In the first one -15/x^4 instead of -12/x^4.

    I think the second one is ok if everything after 8x^8 really is in the denominator (which you could have specified by putting it all in parentheses).
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