Oh, what a delightful little math puzzle we have here! To find two numbers that multiply to 18 and add up to -5, we can think of factors of 18 like 1, 2, 3, 6, 9, and 18. After a little artistic calculation, the numbers that fit our criteria are -2 and -3. Keep exploring these mathematical landscapes, my friend!
-27
21
7
24
-5 and -1
-20
63
-81
33
-273
-58
-18 and -10