The two numbers that add to get 17 and multiply to get 20 are 5 and 12. This is because 5 + 12 = 17 and 5 x 12 = 20. These two numbers satisfy both conditions simultaneously, making them the correct pair.
(20) and (negative 3)
-27
26
20
-3 and -14
-70
-12.385165 and -1.614835
9 and 11.
-151
-67
13
20