For a pair of numbers, the answer is the complex conjugate pair:
12.5 ± 21.9943 i where i is the imaginary square root of -1.
How about: 5*5 = 25 or 1*25 = 25
The numbers are 3 and 25
89
77
-289
4 and 25
-25
25
The numbers are: (25 +sq rt of 817)/2 and (25 -sq rt of 817)/2
129
640*.25=160
640