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Find all complex numbers $z$ such that $z^4 = -4.$

 Aug 3, 2020
 #1
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Here's a hint:

 

i=sqrt(-1)

 

So, if you put {integer} times i, you will be able to get a negative number!

 

Now, find something to the fourth power that gets -4! :D

 Aug 3, 2020

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