COMPLEX function
Converts real and imaginary coefficients into a complex number of the form x + yi or x + yj.
Syntax
COMPLEX(real_num,i_num,suffix)
Real_num is the real coefficient of the complex number.
I_num is the imaginary coefficient of the complex number.
Suffix is the suffix for the imaginary component of the complex number. If omitted, suffix is assumed to be "i".
Note All complex number functions accept "i" and "j" for suffix, but neither "I" nor "J". Using uppercase results in the #VALUE! error value. All functions that accept two or more complex numbers require that all suffixes match.
Remarks

If real_num is nonnumeric, COMPLEX returns the #VALUE! error value.

If i_num is nonnumeric, COMPLEX returns the #VALUE! error value.

If suffix is neither "i" nor "j", COMPLEX returns the #VALUE! error value.
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.

