2 AND 21 there is only one factor that adds up to 23 and if you multiple 21 times 2 =42
25
-111
285
The numbers are: 3 +square root 21 and 3 -square root 21
Well, 18 and 3 (both factors of 36) add up to 21. As well, the factors 12 and 9 add up to 21.
-21
7x7=49
21
41
61
47