IMSUM(inumber1 [,inumber2])

Returns the sum of two or more complex numbers.

inumber1The first complex number.
inumber2(Optional) The second complex number.

* If any of the arguments are not in the form x + yi or x + yj, then #NUM! is returned.
* You can have a maximum of 29 arguments.
* You can use the COMPLEX function to convert real and imaginary coefficients into a complex number.
* In Excel 2007 the format returned by this function was changed so that the imaginary part is displayed in consistent scientific notation.
* For the Microsoft documentation refer to
* For the Google documentation refer to

1=IMSUM("3+4i","5-3i") = 8+i
2=IMSUM("2+2i","2+2i") = 4+4i
3=IMSUM("3+2i","4+6i") = 7+8i
4=IMSUM("3","5i") = 3+5i
5=IMSUM("3+3i","3i-3") = #NUM!
6=IMSUM("some text","5-3i") = #NUM!
7=IMSUM("3+4i","some text") = #NUM!

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