Por favor, expliquem a resolução!
Tendo em vista que x é uma matriz 2x2...
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![B^{t} = \left[\begin{array}{ccc}-1&4\\3&2\end{array}\right]](https://tex.z-dn.net/?f=+B%5E%7Bt%7D+%3D+++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-1%26amp%3B4%5C%5C3%26amp%3B2%5Cend%7Barray%7D%5Cright%5D+ "B^{t} = \left[\begin{array}{ccc}-1&4\\3&2\end{array}\right]")
![X= \left[\begin{array}{ccc}-1&4\\3&2\end{array}\right] - \left[\begin{array}{ccc}1&2\\3&-4\end{array}\right] = \left[\begin{array}{ccc}-2&2\\0&6\end{array}\right]](https://tex.z-dn.net/?f=X%3D++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-1%26amp%3B4%5C%5C3%26amp%3B2%5Cend%7Barray%7D%5Cright%5D+-++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B2%5C%5C3%26amp%3B-4%5Cend%7Barray%7D%5Cright%5D+%3D++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-2%26amp%3B2%5C%5C0%26amp%3B6%5Cend%7Barray%7D%5Cright%5D+%0A "X= \left[\begin{array}{ccc}-1&4\\3&2\end{array}\right] - \left[\begin{array}{ccc}1&2\\3&-4\end{array}\right] = \left[\begin{array}{ccc}-2&2\\0&6\end{array}\right]")
det X = (-2)*6-0*2 = -12 - 0 = -12
Resposta : letra c
det X = (-2)*6-0*2 = -12 - 0 = -12
Resposta : letra c
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