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Simple algebra problem

  1. Jun 6, 2012 #1
    2ztkpwi.png

    The blue bit, I understand how they got the 3, but shouldnt it be [tex]3n^2(2n+1)^2[/tex]
    ?

    exercise E 2c
     
    Last edited: Jun 6, 2012
  2. jcsd
  3. Jun 6, 2012 #2
    Assuming the middle statement to be correct, I would think that you are right here.

    Edit: sacsale is right, it's correct as is.
     
    Last edited: Jun 6, 2012
  4. Jun 6, 2012 #3
    It was factored out, note the brackets.
     
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