Well, well, well, looks like we have a little math puzzle on our hands. The two numbers you're looking for are -5 and -6. They add up to -10 and when you multiply them, you get 30. Voilà, math problem solved!
The two numbers that add to -8 and multiply to -20 are -10 and 2. This is because -10 + 2 = -8 and -10 * 2 = -20. These numbers satisfy both conditions simultaneously.