13
The factor pairs of 12 are (12,1)(6,2)(4,3)
None of them add up to 1. If that's -12, you could use 4 and -3.
-13
-1
-325
-115
463
60
if you multiply them it adds up to 516
624
The numbers are 5 and 12
-13
The numbers are: 12 and -2
The numbers are: 12 and -15