Perform the indicated operation.(10x2 - xy - y2) + (x2 + 5xy + 12y2)
A. 11x2 + 4xy + 11y2
B. 9x2 - 6xy - 13y2
C. 10x2 + 5xy + 12y2
D. 11x2 + 6xy + 13y2
Answer: A
Mathematics
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+ 
A. 
B. 
C. 3x - 4
D. 
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