Two numbers have a difference of 4 and a sum of - 8. What is their product?

Assume the two numbers are x and y

the difference = 4, so x - y = 4

the sum = - 8, so x + y = - 8

by solving both equations

2x = - 4

x = - 2

-2 + y = - 8

y = - 6

the two numbers are - 2 and - 6