Factor completely, if possible.3x2 - 147y2
A. 3(x + 7y)(x - 7y)
B. 3(1 + 7xy)(1 - 7xy)
C. 3(x - 7y)2
D. (3x + 7y)(3x - 7y)
Answer: A
Mathematics
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A. sec ? = 
B. sec ? = 
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