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Math Help - Find Derivative of this function

  1. #16
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    Mar 2007
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    i have to use log(a) instead of ln(a),

    How does this change the question?
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  2. #17
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    ok nevermind, i just had to change the notation. I got the question completely right... apparently i dont understand the chain rule and how to use it..

    Any idea on the other questions?
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  3. #18
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    Quote Originally Posted by dunbeacrab View Post
    ok nevermind, i just had to change the notation. I got the question completely right... apparently i dont understand the chain rule and how to use it..

    Any idea on the other questions?
    Chain rule:

    (d/dx)[f(g(x))] = f'(g(x))*g'(x)
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  4. #19
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    yeah i just went back into the text and figured it out.

    what about the x^4/5-x^9/5 one...

    Did u notice which one of the 4 i listed it would be?
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  5. #20
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    Quote Originally Posted by dunbeacrab View Post
    1/9*(9-5*x)*x^(-1/9)

    (9-4*x)*x^(-1/9)

    1/5*(4-9*x)*x^(-1/5)

    1/4*(5-9*x)*x^(-1/5)


    one of these....
    take out (1/5)*{x^(-1/5)} common
    from f'(x) = (4/5)x^(-1/5) - (9/5)x^(4/5) to get


    (1/5)*(4-9*x)*x^(-1/5)
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  6. #21
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    thanks everyone, i finally finished them all..just in time.
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