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Critical Numbers

  1. Nov 6, 2006 #1
    Find Critical Numbers of:

    F(z) = (z+1)/(z^2+z+1)

    Did I start off correctly??

    D/dz = - (z + 1)(2z+1)/(z^2+z+1)

    I think I derived it correctly??? Where do I go from this step?? Thanks
     
  2. jcsd
  3. Nov 6, 2006 #2

    mathman

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    Science Advisor
    Gold Member

    The derivative is wrong.

    It should be

    ((z^2+z+1)-(z+1)(2z+1))/(z^2+z+1)^2
     
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