Factor the expression.3(x + y)6 - 6(x + y)5 + 9(x + y)7
A. 3(x + y)6(-2 + 3x + 3y)
B. 3(x + y)[(x + y)5 - 2(x + y) + 3(x + y)6]
C. (x + y)5[3x + 3y - 6 + 9(x + y)2]
D. 3(x + y)5[x + y - 2 + 3(x + y)2]
Answer: D
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