Thread:HMcCoy/@comment-25501845-20150620144553/@comment-24808864-20150620225850

It is easiest to use the polar form of complex numbers, and apply a formula called De Moivre's Formula from Precalculus, similar to the KA exercise Powers of complex numbers. The two complex numbers that satisfy  are  and .

These can be easily checked by multiplying out the numbers I am claiming and simplifying.

I am getting close to 10K aren't I? One of these days I might hit it, I am just so busy so far this summer. I am glad that we got the exercises up-to-date at one time, and that you, TJ, Tibet, Virus and others are around to keep things flowing.

Take care!