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Thread: Need help with this polynomial :X

  1. #1
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    Exclamation Need help with this polynomial :X

    Multiply this polynomial using the special product formulas. Express your answer as a single polynomial in standard form.

    And i have to give it in this form.

    Give your answer using the form AxB + CyD.

    (3x - 8)^3

    A=27
    B=3
    C=
    D=

    Ive completed 12/15 but i got stuck on this one. :X

    if someone can do a brief explanation real quick?

    i know A and B but i don't know the rest.

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    Default

    http://en.wikipedia.org/wiki/Binomial_theorem

    That should be enough to help you out.
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    Default

    Yeah, I'm not sure if you're still looking for an answer to this or if you figured it out but it would be in the form

    x^3+3(x^2y)+3(xy^2)+y^3
    So .. (3x)^3 + 3((3x)^2)*8 + 3(3x)(8)^2+(8)^3
    =27x^3 - 216x^2 + 576x - 512

    I know I used more brackets than I had to but I thought it explained it better.

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    http://i54.tinypic.com/107svhi.jpg

    The power (in this case: 3) corresponds to the row in Pascal's Triangle, this gives the co-efficients (1,3,3,1)
    Last edited by Naum; 10-16-2010 at 10:11 AM.

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    TY Naum!

    I understand it alot better now the way you did it!

    I have a test on Thursday so i will make more problems and try them my self

    thanks everyone.

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