Final answer:
The additive inverse of the complex number -8+3i is 8-3i.
Step-by-step explanation:
The additive inverse of a complex number is simply the opposite of that number. In this case, the complex number is -8+3i. To find its additive inverse, we change the sign of both the real and imaginary parts. So, the additive inverse of -8+3i is 8-3i.