Perform the indicated operations.(12x2 - xy - y2) + (x2 + 10xy + 10y2)
A. 13x2 + 11xy + 11y2
B. 11x2 - 11xy - 11y2
C. 12x2 + 10xy + 10y2
D. 13x2 + 9xy + 9y2
Answer: D
Mathematics
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