Fill in the Blank

As an estimating clerk reviewing two component cost models represented by the rational expressions 2x2x12\frac{2}{x^2-x-12} and 1x216\frac{1}{x^2-16}, you must find their Least Common Denominator (LCD) to combine them. After factoring both quadratic denominators completely, the matching common factor shared by both is ____.

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Updated 2026-06-02

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