2(x - 9)
2(9 + x)
81 - x2
-2(x - 9)
Correct answer is D
324−4x22x+18 = 182−(2x)22x+18 = (18−2x)(18+2x)(2x+18) 18 - 2x = 2(9 - x) or -2(x - 9)
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