Factor.p2 - 2pq + q2 - 9r2
A. (p - q + 3r)2
B. (p + q - 3r)2
C. (p + q + 3r)(p - q - 3r)
D. (p - q + 3r)(p - q - 3r)
Answer: D
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A. 
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D. 
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b
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