Use a special product formula to simplify.(3x + 7y)2
A. 9x2 + 49y2
B. 3x2 + 42xy + 49y2
C. 3x2 + 49y2
D. 9x2 + 42xy + 49y2
Answer: D
Mathematics
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? 
A. 
B. 
C. 
D. 
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