Originally Posted by
PvtBillPilgrim I know how to show that,
z^(n+1) - 1 = (z-1)[z^n + z^(n-1) + ... + 1). Mr F says: The correction is in red.
But how do I use this to find the complex roots of
z^4 + z^3 + z^2 + z + 1 = 0 ?
Thanks for any help in advance.