What is the additive inverse of the complex number 9 minus 4 i ?

The additive inverse is the number that sums with the original to make zero. Negate both parts of 9 − 4i: −(9 − 4i) = −9 + 4i. Therefore, the additive inverse is negative 9 plus 4i, choice D.

AI-written and checked against the verified answer.