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Slope of a tangent From first principles

  1. Nov 19, 2009 #1
    1. The problem statement, all variables and given/known data

    # 23 http://img26.imageshack.us/img26/1008/questionsh.jpg [Broken]

    2. Relevant equations

    m1 * m2 = -1

    3. The attempt at a solution

    i get -4 not sure whats wrong:

    http://img4.imageshack.us/img4/6092/15608741.jpg [Broken]
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Nov 19, 2009 #2

    Office_Shredder

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    In general 2a*(-2a) = -4a2

    The question is show that if you have a value of a where a2=1/2-a2 (because this is where the two graphs intersect) then -4a2=-1
     
  4. Nov 19, 2009 #3
    thats it forgot the POI, thank you.
     
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