wortel

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1.2b

$$ \begin{equation} \begin{split} (-\frac{1}{3} \cdot \sqrt{6} \cdot i ) ^ 2& = -\frac{1^2}{3^2} \cdot 6 \cdot i^2\\ & = \frac{1}{9} \cdot 6 \cdot -1\\ & = \frac{6}{9} \cdot -1\\ & = \frac{2}{3} \cdot -1\\ & = -\frac{2}{3} \end{split} \end{equation} $$