1. $A = \left(\begin{array}{cc}1& - 1\\ 0& - 2\end{array}\right)$

• A. $\frac{1}{2} \left(\begin{array}{cc}2& - 1\\ 0& - 1\end{array}\right)$
• B. $\frac{1}{2} \left(\begin{array}{cc}2& - 1\\ 0& - 1\end{array}\right)$
• C. $\frac{1}{2} \left(\begin{array}{cc}2& - 1\\ 0& - 1\end{array}\right)$
• D. $\frac{1}{2} \left(\begin{array}{cc}2& - 1\\ 0& - 1\end{array}\right)$

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