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Summation/Sigma Notation

  1. Apr 15, 2012 #1
    1. The problem statement, all variables and given/known data


    What is happening from the green box to the blue box? I am completely lost as to what this example is trying to show. Would really appreciate some info on this, thanks.


    2. Relevant equations


    sigmanotation-1.jpg
     

    Attached Files:

  2. jcsd
  3. Apr 15, 2012 #2

    LCKurtz

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    This problem assumes you know the formula for the sum of squares of the first n integers. But the sum you are given isn't the over first n integers because it starts at 4. So the idea is to express the sum you want as the difference of two sums for which you know the formula.
     
  4. Apr 15, 2012 #3
    How can I learn what this example assumes I already know? Is this covered in algebra textbooks?
     
  5. Apr 15, 2012 #4

    LCKurtz

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    Yes, usually.
     
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