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Math Help - 4th degree polynomial

  1. #1
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    urgent 4th degree polynomial question

    I don't know how to multiply this out into a polynomial form. Can anyone show me?

    f(x) = (x+3)(x+1)(x-2)(x-5)
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  2. #2
    48v
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    4th Degree Polynomial

    (x+3)(x+1) * (x-2)(x-5)
    (3x^2+4x+3)(x-2) * (x-5)
    (3x^3+4x^2+3x-6x^2-8x-6)(x-5)
    (3x^3-2x^2-5x-6)(x-5)
    3x^4-2x^3-5x^2-6x-15x^3+10x^2+10x+30
    3x^4-17x^3+5x^2+4x+30

    That make sense? There are other ways, but they depend on concepts that you may or may not know. This is known as FOIL'ing or distributing.
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