Posted by James on Friday, April 25, 2008 at 11:27am.
If (x - 2i ) then also the complex conjugate (x+2i) must be a factor. Then of course (x-4) so:
(x-2i)(x+2i)(x-4)
=(x^2+4)(x-4)
=x^3 - 4 x^2 + 4 x -16
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