Hello there! Given the expression -98 - 31:
The additive inverse method implies that although the integers are both negative, we add them and take the sign of the negative number. With that in mind:
98 + 31 = 129
Because 98 is greater than 31, we keep the sign of what 98 originally was, which was negative (the result would have been negative anyway since both numbers were negative).
Simplifying the expression, we would find that -98 - 31 = -129. Hope this helps!