I assume that you are talking about 2 integers one of the integers must be negative while the other is positive we can list integer pairs that multiply to -20: -20 1 20 -1 -10 2 10 -2 5 -4 -5 4 now the only pair that when you add them together equals -8 is -10 and 2, so -10 and 2 add to -8 and multiply to -20