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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