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Oi Rosy. A resposta é oito negativo.
![\left[\begin{array}{ccc}1&0&5\\2&1&7\\3&2&1\end{array}\right] = \\ \\ Det(A) = (1.1.1)+(0.7.3)+(5.2.2)-[(5.1.3)+(7.2.1)+(1.0.2)] \\ \\ Det(A)= 1+0+20-[15+14+0] \\ \\ Det(A)=21-29 \\ \\ Det(A)=-8](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B0%26amp%3B5%5C%5C2%26amp%3B1%26amp%3B7%5C%5C3%26amp%3B2%26amp%3B1%5Cend%7Barray%7D%5Cright%5D+%3D++%5C%5C++%5C%5C+Det%28A%29+%3D+%281.1.1%29%2B%280.7.3%29%2B%285.2.2%29-%5B%285.1.3%29%2B%287.2.1%29%2B%281.0.2%29%5D+%5C%5C++%5C%5C+Det%28A%29%3D+1%2B0%2B20-%5B15%2B14%2B0%5D+%5C%5C++%5C%5C+Det%28A%29%3D21-29+%5C%5C++%5C%5C+Det%28A%29%3D-8 "\left[\begin{array}{ccc}1&0&5\\2&1&7\\3&2&1\end{array}\right] = \\ \\ Det(A) = (1.1.1)+(0.7.3)+(5.2.2)-[(5.1.3)+(7.2.1)+(1.0.2)] \\ \\ Det(A)= 1+0+20-[15+14+0] \\ \\ Det(A)=21-29 \\ \\ Det(A)=-8")
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