wortel

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1.2b $$\begin{equation} \begin{split} (-\frac{1}{3} \cdot \sqrt{6} \cdot i ) ^ 2& = \frac{-1^2}{3^2} \cdot 6 \cdot i^2\\ & = \frac{1}{9} \cdot \frac{6}{1} \cdot -1\\ & = \frac{6}{9} \cdot -1\\ & = \frac{2}{3} \cdot -1\\ & = -\frac{2}{3} \end{split} \end{equation}$$ **1.2c** $$\begin{equation} \begin{split} (\frac{1}{2} \cdot \sqrt{4} \cdot i ) ^ 2& = \frac{1^2}{2^2} \cdot 4 \cdot i^2\\ & = \frac{1}{4} \cdot 4 \cdot i^2\\ & = \frac{1}{4} \cdot \frac{4}{1} \cdot -1\\ & = 1 \cdot -1\\ & = -1\\ \end{split} \end{equation}$$