Question 858175
I am struggling to find the complex solutions of {{{ z^4= -81 }}}
I am assuming that i has a value of 0, I'm not sure how to go about this.
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i <> 0
i = sqrt(-1)
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{{{ z^4= -81 = 81cis(180) + n*360 }}} n = 0, 1, 2, 3
{{{z = 3cis(45) = 3sqrt(2)/2 + 3i*sqrt(2)/2}}}

3cis(135), 3cis(225), 3cis(315)