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Limit Process Summation Confusion

  1. Jul 21, 2011 #1

    I have been staring at this for a while. I under stand the process and can account for and reproduce every step of this problem EXCEPT I can nit figure out where the 6i/n coms from. I have included the equation and the issue is highlighted in yellow.

    Please explain... this is the last piece of the puzzle.



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  2. jcsd
  3. Jul 21, 2011 #2
    uuuuhm, [itex](a+b)^2=a^2+2ab+b^2[/itex]????
  4. Jul 21, 2011 #3
    Man!!!!!!! I am actually getting the calculus but completely blowing the algebra!


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