Which property of addition is shown below? If x = 1 + 2i and y = –1 – 2i, then x + y = 0.

Here, y = −1 − 2i is the additive inverse of x = 1 + 2i. Adding them gives (1 − 1) + (2i − 2i) = 0, which illustrates the inverse property of addition.

AI-written and checked against the verified answer.