Question

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Answer 1

-2 + sqrt(4 - 36)/2
-2 + sqrt(-32)/2
-2 + sqrt(-16*2)/2
-2 +4sqrt(2)i/2
-1 + 2sqrt(2)i

Answer 2

And other root will be -1 - 2sqrt(2)i

Answer 3

\[x=\frac{ -2\pm \sqrt{4-4*9} }{2*1 }=\frac{ -2\pm \sqrt{-32} }{ 2 }=-1\pm \sqrt{-8}\]