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Math Help - multipling poly

  1. #1
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    multipling poly

    4x^2 -2x +6

    x x +3
    --------------------
    12x^2 -6x 18
    4x^3 -2x^2 +6x =
    4x^3 8x^2 +0x +18
    If -6 +6 =0 Why doesn't x -x =0
    Last edited by Leona_Marie; January 20th 2009 at 07:58 PM.
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  2. #2
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    Quote Originally Posted by Leona_Marie View Post
    4x^2 -2x +6

    x x +3
    --------------------
    12x^2 -6x 18
    4x^3 -2x^2 +6x =
    4x^3 8x^2 +0x +18
    If -6 +6 =0 Why doesn't x -x =0
    I really can't make sense of your post. What are you trying to do?
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  3. #3
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    Quote Originally Posted by Leona_Marie View Post
    4x^2 -2x +6

    x x +3
    --------------------
    12x^2 -6x 18
    4x^3 -2x^2 +6x =
    4x^3 8x^2 +0x +18
    If -6 +6 =0 Why doesn't x -x =0
    Ahhh I see.

     (x+3)(4x^2-2x+6) = x(4x^2-2x+6)+3(4x^2-2x+6)

     = 4x^3-2x^2+6x+12x^2-6x+18

     = 4x^3+10x^2+18

     x - x DOES equal zero :S.
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  4. #4
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    Quote Originally Posted by Mush View Post
    Ahhh I see.

     (x+3)(4x^2-2x+6) = x(4x^2-2x+6)+3(4x^2-2x+6)

     = 4x^3-2x^2+6x+12x^2-6x+18

     = 4x^3+10x^2+18

     x - x DOES equal zero :S.
    sorry thats not how I typed it. Im still learing my polys so when I do a problem then look at the answer sometimes they confuse me with bad answers... thats why I ask. thankyou
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