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Complex Numbers

sweeper

New member
Sep 13, 2016
1
Complex numbers
If z=rcis(theta) FIND: |iz^2|
I am confused about how I incorporate the i into the absolute value. I can't remember what it means. Please help and show exactly how I complete the workings. I can easily find the absolute value of z^2 I just really don't understand how to put the i into it.
Thank you!!
 

Evgeny.Makarov

Well-known member
MHB Math Scholar
Jan 30, 2012
2,533
Hi, and welcome to the forum.

You should use the identity $|z_1z_2|=|z_1|\cdot|z_2|$. For the rest, please see this section on Wikipedia.
 

HallsofIvy

Well-known member
MHB Math Helper
Jan 29, 2012
1,151
The absolute value of i is 1!