The sum of is $3$. See Graph I, the resultant $3$ is in RED.
Work Step by Step
The sum of $7 - 3i$ and $-4 + 3i$ is $3$. Refer to Graph I, the complex number, $7 - 3i$ and $-4 + 3i$ are in BLUE, while the resultant $3$ is in RED.
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