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Complex numbers help

I am unsure as to how to do part ii)
I have attached the question below
Could someone explain what the mark scheme is saying
(edited 2 years ago)
Screen Shot 2021-05-26 at 19.50.16.pngScreen Shot 2021-05-26 at 19.51.23.png
Reply 2
Make the substitution u=z2u =z^2 and solve for uu. Then you can find zz.
(edited 2 years ago)
Original post by 0le
Make the substitution u=z2u =z^2 and solve for uu. Then you can find zz.

thank you very much!

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