Factor the sum or difference of two cubes.7r3 - 448
A. 7(r + 4)(r2 - 4r + 16)
B. 7(r - 4)(r2 + 4r + 16)
C. 7(r - 4)(r2 - 4r + 16)
D. 7(r - 28)(r2 + 28r + 112)
Answer: B
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D. 
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