Factor.9pq4 - 9pr4
A. (9pq2 + 9pr2)(9pq2 - 9pr2)
B. (9pq2 + pr2)(pq2 - pr2)
C. 9p(q2 + r2)(q + r)(q - r)
D. 9p(q2 + r2)(q2 - r2)
Answer: C
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