Final answer:
When you add a number to negative infinity, the result is undefined because negative infinity represents a value that is infinitely negative.
Step-by-step explanation:
When you add a number to negative infinity, the result is undefined.
This is because negative infinity represents a value that is infinitely negative, while the number you are adding represents a specific value. The two cannot be combined in a meaningful way.
For example, if we have −∞ + 5, the result is undefined because we cannot determine what the sum of negative infinity and 5 would be.