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April 20, 2014

Homework Help: PreCalc

Posted by Barb on Wednesday, September 22, 2010 at 10:27pm.

6.Given -2i is a root, determine all other roots of x^4-10x^3+42x^2-88x+80.
A. x= +/- 4, 2i
B.x= -2, +/- 4i
C.x= -4, +/- 2
D.x= -4, 2i
E.x= +/- 4, 2

Please help, I do not understand where to begin.

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