2(x - 9)
2(9 + x)
81 - x\(^2\)
-2(x - 9)
Correct answer is D
234 - 4x\(^2\) = 18\(^2\) - (2x)\(^2\) = (18 - 2x)(18 + 2x)
2x + 18 = 2x + 18 = (2x + 18)
18 - 2x = 2(a - x) or -2(x - a)
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