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Math Help - Don't understand how to factorize this

  1. #1
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    Don't understand how to factorize this

    Basically, trying to factorize (a-2)^3 - (a+1)^3, the workbook unit's about using the sum and difference of 2 cubes.
    Any help would be appreciated
    Btw, the answer was -9(a^2 - a + 1)
    Last edited by Razbaz; February 6th 2013 at 08:40 PM.
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  2. #2
    MHF Contributor
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    Re: Don't understand how to factorize this

    Hey Razbaz.

    The difference of two cubes formula is x^3 - y^3 = (x-y)(x^2 + xy + y^2). (Hint let x = a - 2 and guess what y should be).
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