8 and -8; 8 + (-8) = 8 - 8 = 0, and 8 - (-8) = 8 + 8 = 16
That if one of them is a, the other is -a.
because an integer is a whole number. So the product must be a whole number.
the positive integer
Two integerss add to zero when their absolute values are equal and they have opposite signs.