Marcus finds that open paren 3 x squared minus 2 y squared plus 5 x close paren plus open paren 4 x squared plus 12 y squared minus 7 x close paren is equal to 7 x squared minus 10 y squared minus 2 x What error did Marcus make?
Answer
A
He combined the terms 3 x squared and 4 x squared incorrectly.
B
He subtracted the polynomials instead of adding.
C
He combined the terms 5 x and negative 7 x incorrectly.
D
He combined the terms negative 2 y squared and 12 y squared incorrectly.