Add.(10x2 - xy - y2) + (x2 + 11xy + 6y2)
A. 9x2 - 12xy - 7y2
B. 11x2 + 10xy + 5y2
C. 11x2 + 12xy + 7y2
D. 10x2 + 11xy + 6y2
Answer: B
Mathematics
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