1 + 20
2 + 19
3 + 18
4 + 17
5 + 16
7 + 14
8 + 13
9 + 12
10 + 11
All numbers that add to make 21 :)
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57
111
21
-1
There are no two real numbers that do, but two complex numbers do: (3.5 + i 3.5 √23) and (3.5 - i 3.5 √23) If you want them to add to 7 and multiply to -294, then the two real numbers -14 and 21 work. Or if you want them to add to -7 and multiply to -294, then the two real numbers 14 and -21 work. To add to -7 and multiply to 294, the following two complex numbers work: (-3.5 + i 3.5 √23) and (-3.5 - i 3.5 √23)