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Thread: factoring basic college algebra problem

  1. September 22nd 2010, 04:42 PM #1
    siberianfog
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    factoring basic college algebra problem

    cant figure this one out. just need to factor it
    8r^3 - 27

    ive got to

    (2r)^3 - 3^3
    Last edited by siberianfog; September 22nd 2010 at 05:01 PM.
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  2. September 22nd 2010, 05:12 PM #2
    skeeter
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    Quote Originally Posted by siberianfog View Post
    cant figure this one out. just need to factor it
    8r^3 - 27

    ive got to

    (2r)^3 - 3^3
    the factoring format for the difference (and sum) of two cubes should be in your text ...

    a^3 - b^3 = (a-b)(a^2+ab+b^2)
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