Verified Answer :

konrad509

\(x^2+9=0\\ x^2=-9\\ x=\sqrt{-9} \vee x=-\sqrt{-9}\\ x=\sqrt{-1\cdot9} \vee x=-\sqrt{-1\cdot9}\\ x=\sqrt{-1}\cdot\sqrt9 \vee x=-\sqrt{-1}\cdot \sqrt9\\ x=i\cdot3 \vee -i\cdot3\\ x=3i \vee x=-3i\)

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