(adsbygoogle = window.adsbygoogle || []).push({}); Complex Number, again... :(

This I'll give you the entire question and answer.

10. Solve:

[tex]z^4-2z^2+4=0[/tex]

That's all I got.

Answer:

[tex]+-1/2(\sqrt{6}+-\sqrt{2i}) (four combinations of signs).[/tex]

That is all.

I tried factoring, but I can't come up with anything. I also tried bisecting, but that is useless.

Knowing that the solution has complex numbers, I have no clue where they got this from.

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# Complex Number, again

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