Call two integers is a and b ( \(a,b\in Z\))

Because a and b have the same role, suppose a > b

So we have:

a - b = -18

a + b = 2

=> a = ( -18 + 2) / 2 = -8

=> b = -8 -2 = -10

So their product is: -8 x (-10) = 80

Lê Quốc Trần Anh selected this answer.