Perform the indicated operation.(11x2 - xy - y2) + (x2 + 5xy + 6y2)

A. 10x2 - 6xy - 7y2
B. 12x2 + 4xy + 5y2
C. 12x2 + 6xy + 7y2
D. 11x2 + 5xy + 6y2


Answer: B

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