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Thread: Who knows the formula to factor a cube?

  1. #1
    2 + 2 = 5
    Join Date
    Apr 2003
    Location
    Parker, Colorado
    Posts
    73

    Who knows the formula to factor a cube?

    Ex:

    (x-1) will factor out to be (x - 3x + 3x - 1).

    There is some formula to do this without having to use a pencil or paper. I need to know it for my Math Final tomorrow.

    Thanks in advance.
    DC

    [size=1]Peace out fk. Thanks for all the good times .

  2. #2
    Opu Nui
    Join Date
    Jan 2003
    Location
    I'd rather be in Hawaii
    Posts
    79

    Pascal's Triangle

    This may reach you too late but, the way to expand polynomials quickly is by Pascal's triangle

    1
    1 2 1
    1 3 3 1
    1 4 6 4 1
    1 5 10 10 5 1

    ie. your x^3 poly is expanded to the 3d row down or 1x^3+3x^2+3x+1
    or your x^5 is 1x^5+5x^4+10x^3+10x^2+5x+1
    To get more rows add the numbers diagonally above the space that you are trying to fill.
    Hope this helps.

    -Swim'n Sasquatch

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