Find all complex numbers such that z^{4} = -4

Note: All solutions should be expressed in the form a+bi, where a and b are real numbers.

This has been asked about a half of a dozen times in the last 6 months......search to see if you can find the explanation of the answer...

here are TWo of th answers

-1+i

-1-i

https://web2.0calc.com/questions/find-all-complex-numbers-z-such-that-z-4-4-please-help-and-tysm