-10
You can write two equations for this, and solve them simultaneously:
ab = -23
a + b = 13
-2/3 & 3/2
23
37
5+5 By quadratic equation the two numbers (roots) are: 8.872983346 and 1.127016653 Added together = 10 Multiplied = 10
1, 2 and 3
-8 and 7
-2/3 & 3/2
15 and -3
-4 and -25
-8 and -4
-3 and 6
24
6 and -5
67
23
5
x=-11 y=1 or x=1 y=-11