4
-2 and -4 do that.
-103
2
1+178 2+177 3+176...
(5/2 + √17/2) ≈ 4.562, and(5/2 - √17/2) ≈ 0.438
19
171
Yes. If equals are added to equals, then the results of the additions are equal.
7.5516 and 70.4484 (approx)
2 and 3
When equals are added to equals, you don't necessarily get wholes. But whatever you do get, they're equal.
The two numbers that have a product of -2 and a sum of -1 are 1 and -2. When multiplied, 1 × -2 equals -2, and when added, 1 + (-2) equals -1.