Řeš v \mathbb{C} rovnici:
\large x^2+9+\sqrt {x^2+9} = 0
\large K = \left \{-3\text{i};0\right \}
\large K = \left \{0;3\text{i}\right \}
\large K = \left \{3\text{i};-3\right \}
\large K = \left \{-3\text{i};3\text{i}\right \}
