Factor the polynomial by substitution.a2(a + b)2 - ab(a + b)2 - 72b2(a + b)2
A. (a + b)2(a - 9)(a + 8)
B. (a + b)2(a - 8b)(a + 9b)
C. (a - 9b)(a + 8b)(a + b)
D. (a + b)2(a - 9b)(a + 8b)
Answer: D
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