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Math Help - polynomial question

  1. #1
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    polynomial question

    (5 - 2x + 3x^2 + x^3) - (-2 + x - x^3)


    Combine like terms, right?
    5 and -2
    -2x and x
    3x^2
    x^3 and -x^3

    3 -1x + 3x^2 - x^3

    Is this right?
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  2. #2
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    Reply

    The second group of terms has a minus sign in front. Please recheck your work.
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  3. #3
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    (5 - 2x + 3x^2 + x^3) - (-2 + x - x^3)

    first remove the brackets by expanding in the minus sign.

    5 - 2x + 3x^2 + x^3+2 - x + x^3

     2x^3+ 3x^2- 3x  +7
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  4. #4
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    7 - 3x + 3x^2 + x^3

    Okay, that makes sense. I forgot to switch the signs.

    Is this correct?
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  5. #5
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    Okay, thanks. I wasn't sure if I was supposed to make it 2x or not. Got it.
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