Respuesta :

[tex]\begin{gathered} \text{ The function of the graph}, \\ f(x)=\frac{4}{x^2-2x-3} \end{gathered}[/tex]

From the graph, f(x) decreases from (1, 3) , (3,∞)

Therefore, the correct answer is

[tex](1,\text{ 3)}\cup(3,\text{ }\infty)[/tex]

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