-25
129
640
-25
If you've written that correctly, there aren't two whole numbers that satisfy those conditions. -20 and -5 add to -25, but multiply to 100. -25 and 4 multiply to -100, but add to -21.
How about: 5*5 = 25 or 1*25 = 25
89
The numbers are 3 and 25
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