Add.(4x2 + 2xy + y2) + (3x2 + 6xy - y2) + (x2 + xy - y2)
A. 8x2 + 9xy - y2
B. 8x2 + 9xy + y2
C. 6x2 + 7xy - y2
D. 7x2 + 8xy - y2
Answer: A
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