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When is y = 2/(4-x) concave downwards?

  1. Apr 8, 2009 #1
    17. For what value of x is the graph of y = 2 / (4 - x) concave downwards?

    I found the first derivative = 2/(4-x)^2

    And then the second 4/(4-x)^3

    But I think I might have messed up somewhere in there
     
  2. jcsd
  3. Apr 8, 2009 #2
    Last edited: Apr 8, 2009
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