IMSQRT(inumber)

Returns the square root of a complex number.

inumberThe complex number for which you want the square root.

Remarks

* If "inumber" is not in the form x + yi or x + yj, then #NUM! is returned.
* 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.
* In Excel 2007 the accuracy of this function was improved.
* In Excel 2003 this function was only available when you had the Analysis ToolPak add-in loaded.
* For the Microsoft documentation refer to support.office.com

 A
1=IMSQRT("1+i") = 1.09868411346781+0.455089860562227i
2=IMSQRT("2+3i") = 1.67414922803554+0.895977476129838i
3=IMSQRT("4") = 2
4=IMSQRT("9") = 3
5=IMSQRT("some text") = #NUM!


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