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14 May, 16:11

Marcus finds that (3x2-2y2+5x) + (4x2+12y2-7x) = 7x2-10y2-2x. What error did Marcus make?

He combined the terms 5x and - 7x incorrectly.

He combined the terms 3x2 and 4x2 incorrectly.

He combined the terms - 2y2 and 12y2 incorrectly.

He subtracted the polynomials instead of adding.

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Answers (2)
  1. 14 May, 16:28
    0
    Given : (3x² - 2y² + 5x) + (4x² + 12y² - 7x)

    Rearranging like terms, we get:

    ⇒ (3x² + 4x²) + (12y² - 2y²) - 7x + 5x

    ⇒ 7x² + 10y² - 2x

    But, Marcus got the Answer as : 7x² - 10y² - 2x

    Marcus combined the terms - 2y² and 12y² Incorrectly
  2. 14 May, 17:01
    0
    C. Marcus combined the terms - 2y² and 12y² Incorrectly

    Step-by-step explanation:

    got it right on the quiz
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