Why does multiplying two negative numbers equal a positive number?

Question

Why does multiplying two negative numbers equal a positive number?

In: 1210

Answer 1

The way that makes sense to me is negative means “opposite sign”. So a negative times a positive is negative because you’re taking the opposite sign for that number. If you do negative times negative, it is positive because positive is the opposite of negative. I had to think of it this way for some physics equations to make sense.