Factor the expression completely, if possible.x4 - 81
A. (x + 3)2(x - 3)2
B. (x2 + 9)(x + 3)(x - 3)
C. (x2 - 9)(x + 3)(x - 3)
D. Does not factor
Answer: B
Mathematics
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+ 
+ 
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A. 
B. 
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A. 
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- 
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