Factor by grouping. Assume any variable exponents represent whole numbers.x2 + 3x + 7x + 21
A. (x + 3)(x + 7)
B. (x2 + 3)(x + 7)
C. (x - 3)(x - 7)
D. (x + 3)(x2 + 7)
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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