Correct Answer: Option D

Explanation

\(\frac{324 - 4x^2}{2x + 18}\) = \(\frac{18^2 - (2x)^2}{2x + 18}\)

= \(\frac{(18 - 2x)(18 + 2x)}{(2x + 18)}\)

18 - 2x = 2(9 - x)

or -2(x - 9)

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