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Math Help - Where did I go wrong?

  1. #1
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    Where did I go wrong?

    Ok here is the problem

    9x^3 - 7x^2 + 4x^2 - x + 4x^3 - 3x^2


    I got 13x^3-6a-x

    but the answer is 13x^3-x
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  2. #2
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    Re: Where did I go wrong?

    Quote Originally Posted by queequeeg View Post
    Ok here is the problem

    9x^3 - 7x^2 + 4x^2 - x + 4x^3 - 3x^2


    I got 13x^3-6a-x <--- where does the -6a come from?

    but the answer is 13x^3-x <--- if this is correct then the original term reads:
    9x^3 - 7x^2 + 4x^2 - x + 4x^3 + 3x^2
    ...
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  3. #3
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    Re: Where did I go wrong?

    Sorry im sorry the 6a was just 6x^2

    My answer still is 13x^3-6x^2-x

    but it reads on the book 13x^3-x

    And i said the same thing about it would have to be + 3x^2 for the answer to be 13x^3-x

    Well my class is tommorrow so i am going to tell this to my teacher.
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  4. #4
    MHF Contributor Siron's Avatar
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    Re: Where did I go wrong?

    If you've 9x^3 - 7x^2 + 4x^2 - x + 4x^3 - 3x^2 then 13x^3-6x^2-x is fine.
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