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Math Help - Differentiation help

  1. #1
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    Differentiation help

    Differentiation help-help.jpg anyone know how to do these questions
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  2. #2
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    Re: Differentiation help

    the questions are on the image.
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  3. #3
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    Re: Differentiation help

    The instructions on the sheet are very clear... What part do you not know how to do?
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    Re: Differentiation help

    Quote Originally Posted by needhelpfastmaths View Post
    Click image for larger version. 

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ID:	23053 anyone know how to do these questions
    6.c,d

    \begin{array}{l}\frac{{dV}}{{dx}} = 12{x^2} - 52x + 40\\12{x^2} - 52x + 40 = 0 \Rightarrow 3{x^2} - 13x + 10 = 0\\{x_1} = \frac{{10}}{3};{x_2} = 1\\{V_{\max }} = 4 \cdot {\left( {\frac{{10}}{3}} \right)^3} - 26 \cdot {\left({\frac{{10}}{3}} \right)^2} + 40 \cdot \frac{{10}}{3}\end{array}
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