1. Sep 26, 2005 #1

   compute_a_nerd

   

   Hello all.
   I am given the equation [tex] (x^3 y^4)^5 = x-y [/tex]
   
   my derivative is [tex] 1/ (15x^2 20y^3(x^3y^4)^4)=y' [/tex]
   
   But the book says: [tex] y'=(1-15x^14y^20)/(1+20x^15y^19)[/tex]
   
   Where did I go wrong?
   
   Thanks so much
   Chris

    

   compute_a_nerd, Sep 26, 2005
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3. Sep 26, 2005 #2

   Tide

   

   Science Advisor

   Homework Helper

   You didn't differentiate the left side correctly. Try again.

    

   Tide, Sep 26, 2005
4. Sep 27, 2005 #3

   Fermat

   

   Homework Helper

   You need to put curly brackets around all of your power if there is more than one character involved - like so,
   
   [tex] y'=(1-15x^{14}y^{20})/(1+20x^{15}y^{19})[/tex]

    

   Fermat, Sep 27, 2005

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