The domain of the function f(x) seems to be the entire set of real numbers. However, there might be an interval where the function behaves differently. To identify such an interval, we can analyze the behavior of the function over the given range of values. 

Looking at the output values, we can observe that there is a change in behavior around x = 0. The function outputs a negative value for x < 0, decreases further as x approaches 0, and then starts increasing again for x > 0. This suggests that the function might have different operations or algorithms implemented for negative, zero, and positive values of x. 

