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Math Help - Critical numbers help

  1. #1
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    Nov 2009
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    Unhappy Critical numbers help

    Okay, this is my problem:



    I solved, and got the derivative of f '(x)= -4/5x(9-x^2)^2-5

    Can someone help me and let me know If I got the correct derivative, and if so, where do I go from here? What do I set equal to zero to get the criticals?
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  2. #2
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    Quote Originally Posted by thatonegurl View Post
    Okay, this is my problem:



    I solved, and got the derivative of f '(x)= -4/5x(9-x^2)^2-5

    Can someone help me and let me know If I got the correct derivative, and if so, where do I go from here? What do I set equal to zero to get the criticals?
    I think the correct derivative is..

    1.(9-X^2)^0.6
    2.(0.6)(-2X) multiplied by (9-X^2)^-0.4
    3.-1.2X(9-X^2)^(-0.4)
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