A) $ -2i $
B) $ 2i $
C) $ -2i,-2i $
D) $ 2i,2i $
Correct Answer: C
We have $ ix^{2}-4x-4i=0 $
Þ $ x^{2}+4ix-4=0 $
Þ $ x^{2}+2ix+2ix-4=0 $
Þ $ (x+2i)(x+2i)=0 $
Þ $ x=-2i,-2i $ .
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