When it is stated that the domain of a function is -infinity or infinity, it means that the function is defined and valid for all possible input values in the real number system. In other words, there are no restrictions on the values that can be plugged into the function. The function is defined and can be applied to any real number.
When we refer to the domain of a function being "-infinity or infinity," it means that the function is defined and can take input values from negative infinity to positive infinity, without any restrictions. In other words, there are no specific values or intervals where the function is undefined or doesn't make sense. The domain encompasses the entire real number line, and the function is considered valid for all real numbers.
