Th numbers are: 2 and -9
6*1
-6 and -1.
55
There is no answer, it is not possible
The factor pairs of 15 are (15, 1) (5, 3) Neither of them adds up to eight. There is no integral solution to this problem.
7
-25
6*1
-6 and -1.
-12 and +5
25
-313
19
55
-713
16
-127