2(x - 9)
2(9 + x)
81 - x2
-2(x - 9)
Correct answer is D
\(\frac{324 - 4x^2}{2x + 18}\) = \(\frac{18^2 - (2x)^2}{2x + 18}\) = \(\frac{(18 - 2x)(18 + 2x)}{(2x + 18)}\) 18 - 2x = 2(9 - x) or -2(x - 9)
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