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Factoring negative quantity from algebraic expression?

  1. May 4, 2008 #1
    Factoring negative quantity from algebraic expression???

    Why is this wrong???

    [tex]\displaystyle{28xy^2 - 14x = -14x(-2y^2 + 1)}[/tex]

    The book instead does this:

    [tex]\displaystyle{28xy^2 - 14x = -7x(-4y^2 + 2)}[/tex]
     
  2. jcsd
  3. May 4, 2008 #2
    Your book is incorrect
     
  4. May 4, 2008 #3

    Hurkyl

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    Those are both valid factorizations.
     
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