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Homework Help: Mistake in my book?

  1. Mar 28, 2008 #1
    (1/3)(b^2+ab+a^2)-(1/4)(b^2+2ab+a^2)

    = (b-a)^2
    --------
    12


    I am ok with this but there is am intermediate step shown


    (b^2-2ab+a^2)
    -------------- (2)
    12

    I don't see where the multiplication by 2 comes from and it is not shown in the errata.
     
  2. jcsd
  3. Mar 28, 2008 #2

    kdv

    User Avatar


    You are right that there should be no multiplication by two there.

    I am not sure how it exactly appears in your book, but does it appear like you typed it here, with the 2 between parentheses? I am asking because sometimes books number equations and often when equations are numbered, the number is put between parentheses.
     
  4. Mar 28, 2008 #3
    :rofl:
     
  5. Mar 28, 2008 #4
    It is clearly a multiplication. It is a solution manual for a text and I can't find a published errata. I am just going to assume it is a mistake and move on. Thank you, kdv.
     
  6. Mar 28, 2008 #5

    kdv

    User Avatar

    Ok. Then it is a typo.

    You are welcome.
     
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