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Math Help - Factoring Help - hw due help!

  1. #1
    dahcetmoht
    Guest

    Factoring Help - hw due help!

    Math HW due.. need help tonight bad.

    Need to factor the following
    (If I erase some of the problems, its because someone already did them. thanks)

    2. 27x^3-64

    3. 3x^3+x^2-12x-4
    Last edited by dahcetmoht; March 3rd 2008 at 08:57 PM.
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  2. #2
    Member
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    Westwood, Los Angeles, CA
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    27x^3 - 64 is a difference of two cubes - consider it written as (3x)^3 - 4^3. Use the formula for difference of two cubes with a=3x and b=4.

    For the other problem, 3x^3+x^2-12x-4, out of the first two terms, factor x^2 and out of the last two terms factor out -4. This gives:

    x^2(3x+1)-4(3x+1). Now, both terms have a (3x+1) in common, so factor that out, giving:

    (3x+1)(x^2-4). The last step for finishing this one is to factpr x^2-4, which is a difference of squares.

    Hope this helps!
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