21
13
-1
43
293 is already prime. Those numbers don't exist.
12
The sum of two numbers is those two numbers multiplied together. For instance, the sum of 4 and 5 is 20.
Multiplying two numbers together will create a common multiple. It is sometimes, but not always, the LCM as well.
The factor pairs of 4 are (4,1) and (2,2). Neither of them add up to 3. If your question was about negative 4, you could use 4 and -1.
They cannot be integers or whole numbers; but they can be numbers with decimals. There are many possibilities; if the numbers are the same, then that is the square root of 10000000 which is 3162.277666...repeating. Those same numbers multiplied together = 10000000. If numbers are different, there are other combinations, all involving decimals
Those numbers are called factors. A pair of those is called a factor pair.
The numbers are: -27+6*sq rt of 14 and -27-6*sq rt of 14