Add or subtract as indicated.(7x2 - xy - y2) + (x2 + 3xy + 6y2)
A. 6x2 - 4xy - 7y2
B. 8x2 + 2xy + 5y2
C. 7x2 + 3xy + 6y2
D. 8x2 + 4xy + 7y2
Answer: B
Mathematics
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