Slope of a tangent From first principles

  • Thread starter Matt1234
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  • #1
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Homework Statement



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

Homework Equations



m1 * m2 = -1

The Attempt at a Solution



i get -4 not sure whats wrong:

http://img4.imageshack.us/img4/6092/15608741.jpg [Broken]
 
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Answers and Replies

  • #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
 
  • #3
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thats it forgot the POI, thank you.
 

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