Add.(4x2 - xy - y2) + (x2 + 9xy + 7y2)
A. 3x2 - 10xy - 8y2
B. 5x2 + 8xy + 6y2
C. 4x2 + 9xy + 7y2
D. 5x2 + 10xy + 8y2
Answer: B
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