IMPRODUCT function
Returns the product of 1 to 255 complex numbers in x + yi or x + yj text format.
Syntax
IMPRODUCT(inumber1,inumber2,...)
Inumber1, inumber2,… are 1 to 255 complex numbers to multiply.
Remarks

Use COMPLEX to convert real and imaginary coefficients into a complex number.

The product of two complex numbers is:
Example
The example may be easier to understand if you copy it to a blank worksheet.
How to copy an example

Create a blank workbook or worksheet.

Select the example in the Help topic.
Note Do not select the row or column headers.
Selecting an example from Help

Press CTRL+C.

In the worksheet, select cell A1, and press CTRL+V.

To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

