Perform the indicated operations.( 9x2 - 4xy - 1) + ( -7x2 - 5x + 8)
A. 2x2 - 9xy + 7
B. 2x2 - 9xy - 9
C. 16x2 - 4xy - 5x + 9
D. 2x2 - 4xy - 5x + 7
Answer: D
Mathematics
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