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Math Help - partial derivative help

  1. #1
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    partial derivative help

    the fyy of -z^2/y
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  2. #2
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    Quote Originally Posted by monkey2 View Post
    the fyy of -z^2/y
    f(y,z)=\frac{-z^2}{y}

    f_{yy}(y,z)=\frac{\partial^2f}{\partial y^2}

    All you have to do is treat the z as a constant, and apply the quotient rule successively.


    \frac{\partial}{\partial y}\frac{-(-z^2)}{y^2}=\frac{\partial}{\partial y}\frac{z^2}{y^2}=\frac{-2yz^2}{y^4}=\frac{-2z^2}{y^3}
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