SOLUTION: what are the fourth roots of negative 16 in polar form?

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Question 957205: what are the fourth roots of negative 16 in polar form?
Answer by Alan3354(69443) About Me  (Show Source):
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what are the fourth roots of negative 16 in polar form?
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-16 = 16cis(180) [ and cis(540), cis(900), cis(1260), etc]
root%284%2C-16%29+=+2cis%2845%29 + n*90, n = 0,1,2,3...