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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- September 27th 2005, 04:55 PMu317durgent 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) - September 27th 2005, 08:41 PM48v4th 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.