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To form the additive inverse, negate all parts of the complex number

→ 8 + 3i → -8 - 3i

The sum of a number and its additive inverse is 0:

(8 + 3i) + (-8 - 3i) = (8 + -8) + (3 + -3)i = (8 - 8) + (3 - 3)i = 0 + 0i = 0.

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