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Math Help - please check if I answered correctly

  1. #1
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    please check if I answered correctly

    (2+4x+9x^2+3x^3)+(1-4x+9x^5-3x^3) =

    i got 3+81x^4, is that right?
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by mathdummy22 View Post
    (2+4x+9x^2+3x^3)+(1-4x+9x^5-3x^3) =

    i got 3+81x^4, is that right?
    You can only combine 'like' terms. Like terms are terms that have the same variable and exponent.

    Answer should be 3+9x^2+9x^5
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