Marcus finds that (3x^2-2y^2+5x) + (4x^2+12y-7x) = 7x^2-10y^2-2x What error did Marcus make?
A: He combined the terms 5x and - 7x incorrectly.
B: He combined the terms 3x^2 and 4x^2 incorrectly.
C: He combined the terms - 2y^2 and 12y^2 incorrectly.
D: He subtracted the polynomials instead of adding.
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Home » Mathematics » Marcus finds that (3x^2-2y^2+5x) + (4x^2+12y-7x) = 7x^2-10y^2-2x What error did Marcus make? A: He combined the terms 5x and - 7x incorrectly. B: He combined the terms 3x^2 and 4x^2 incorrectly. C: He combined the terms - 2y^2 and 12y^2 incorrectly.