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8 October, 08:42

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

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Answers (2)
  1. 8 October, 08:53
    0
    2x^2 + 5x

    Step-by-step explanation:

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

    Combine like terms

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

    2x^2 + 5x
  2. 8 October, 09:11
    0
    Just combine like terms:

    2x^2+5x
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