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Math Help - Critical Point / Derivative Test!!!! HELP

  1. #1
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    Critical Point / Derivative Test!!!! HELP

    Help me solve this problem....
    Attached Thumbnails Attached Thumbnails Critical Point / Derivative Test!!!! HELP-screenshot-2014-05-10-19.58.55.png  
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  2. #2
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    Re: Critical Point / Derivative Test!!!! HELP

    do you know how to find critical points? I'm guessing you should.
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  3. #3
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    Re: Critical Point / Derivative Test!!!! HELP

    I taught i did ...but i keep getting the wrong answer....i just need a fresh new set of set....im taking an online class it and it explains less
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    Re: Critical Point / Derivative Test!!!! HELP

    Quote Originally Posted by yeatch View Post
    I taught i did ...but i keep getting the wrong answer....i just need a fresh new set of set....im taking an online class it and it explains less
    solve $\dfrac {df}{dx}(x)=0$ for $x$ to find your critical points.
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  5. #5
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    Re: Critical Point / Derivative Test!!!! HELP

    After i find the critical point of the derivative, whats next??
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    Re: Critical Point / Derivative Test!!!! HELP

    Quote Originally Posted by yeatch View Post
    After i find the critical point of the derivative, whats next??
    $\dfrac {d^2f}{{dx}^2}(x_{crit})>0 \Rightarrow x_{crit} \mbox{ is a local minimum. }$

    $\dfrac {d^2f}{{dx}^2}(x_{crit})<0 \Rightarrow x_{crit} \mbox{ is a local maximum. }$
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