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Ответ:

[tex] \frac{n - 4}{ {n }^{2} - 16} = \frac{n - 4}{ {n}^{2} - {4}^{2} } = \frac{n - 4}{(n - 4)(n + 4)} = \frac{1}{n + 4} \\ f(x) = \frac{1}{n + 4} = \frac{1}{4 + 4} = \frac{1}{8} = 0.125[/tex]