IMSUM

The Excel IMSUM function returns the sum of two or more complex numbers. For example: The IMSUM function takes in two or more arguments in the form inumber1, inumber2, inumber3, and so on. Arguments can be hard-coded values, cell references, or a range. Use the IMSUM function in a range like this: If Excel encounters values not recognized as complex numbers, a #NUM! Error is thrown. The sum of two complex numbers is visualized by arranging the arrows tip-to-tail and drawing an arrow from the origin to the tip of the second number. For example, the sum of "4+3i" and "2-5i" is visualized below, where the arrow "6-2i" is the sum of the complex numbers. Image courtesy of wumbo.net.