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.

Question

Mathematics

Alexandria Fleming

28 January, 10:47

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.

+1

Answers (1)

Know the Answer?

Mitch · Answer 1

I believe the correct answer from the choices listed above is option C. The error that Marcus made would be that he combined the terms - 2y^2 and 12y^2 incorrectly. It should be 10y^2 when combined not - 10y^2. Hope this answers the question.

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.