Perform the indicated operations and write the resulting polynomial in descending order of degree.(9m2n - 8mn + 8mn2) - (3m2n + 7mn - 4mn2)
A. 6m2n - 3
B. 6m4n2 - 15mn + 12m2n4
C. 6m4n2 - 15m2n2 + 12m2n4
D. 6m2n - 15mn + 12mn2
Answer: D
Mathematics
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A. -5
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Mathematics