They are: -3 and 4
Two factors of 56 with a sum of 18 are 8 and 10.
4 and 6.
4 and 2 are factors of -28.
How about: 4+12 = 16
They are: -3 and 4
Two factors of 56 with a sum of 18 are 8 and 10.
4 and 7
4 and 7
4 and 6.
4 and 2 are factors of -28.
6 and 4
4 and 7.
How about: 4+12 = 16
131 and 4
-6 and -4
The factors of 64 are 1, 2, 4, 8, 16, 32 and 64. No two of them add up to 19.