Answer
The function is constant on the interval $(-∞,∞)$
Work Step by Step
For any $x_1$ and $x_2$ in interval $(-∞,∞)$, $f(x_1)=f(x_2)$
$f(-4)=3$
$f(0)=3$
$f(2)=3$
$f(5)=3$
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