Factor the polynomial completely.81k2 - 16m2
A. (81k + m)(k - 16m)
B. (9k + 4m)(9k - 4m)
C. (9k - 4m)2
D. (9k + 4m)2
Answer: B
Mathematics
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A. 2,401 B. 392 C. 354 D. 343 E. none of these
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A. (-?, 1]
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C. (-13, ?)
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