Tuesday
September 23, 2014

Homework Help: Algebra

Posted by Lynn on Thursday, April 3, 2008 at 5:47pm.

I am trying to find the real coefficients of the given roots. Did I do this right?

3,-9,3+2i

(x-3)(x+9)[x-(3+2i)][x-(3-2i)]=0
(x-3)(x+0)[(x-3)+2i][(x-3)-2i]=0
(x-3)(x+9)[(x-3)^2-2i^2]=0
(x-3)(x+9)(x^2-6x-8)=0
(x^4-71x^2+114x+216)=0
answer x^4-71x^2+114x+216=0

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