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if1-i is a root, so its complex conjugate, 1+i. Write factors (x−k) where k is a root for all 3 roots. Then multiply together. (x−(−5))(x−(1−i))(x−(1+i))=(x+5)(x2−x(1+i)−x(1−i)+1(1−i)(1+i)) =(x+5)(x2−x−ix−x+ix+1ii2) =(x+5)(x2−2x+2) =x3−2x2+2x+5x2−10x+10 =x3+3x2−8x+10
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