Posted by julez on Saturday, October 29, 2011 at 8:20pm.
Hint: If x = 1+i is a root, x = 1 -i must also be a root. Comples roots occur in pairs.
So (x+10), (x- 1 -i) and x -1 + i) must be factors.
Multiply all that out for a third order polynomial.
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