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Math Help - Expand (x+3) (x-4) (2x+1)

  1. #1
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    Cool Expand (x+3) (x-4) (2x+1)

    expand fully and simplify

    expand and simplify each of this
    (x+3) (x-4) (2x+1)


    answer as the back of my book is :2xcubed -xsquared -25x - 12

    how do you get that

    please help
    Last edited by mr fantastic; August 30th 2011 at 07:26 PM. Reason: Re-titled.
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  2. #2
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    Re: help me with this

    Hi Pwnedkid,
    Multiply the first two terms which gives x^2-x-12 then multiply this times 2x+1 You will get the right answer after simplification
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