Calcule os determinantes a seguir:
A) B= ![\left[\begin{array}{ccc}-5&-3&\\-8&-6&\\&&\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-5%26amp%3B-3%26amp%3B%5C%5C-8%26amp%3B-6%26amp%3B%5C%5C%26amp%3B%26amp%3B%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}-5&-3&\\-8&-6&\\&&\end{array}\right]")
B) B=![\left[\begin{array}{ccc}6&5&-9\\8&7&-6\\2&4&-3\end{array}\right]](https://tex.z-dn.net/?f=+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D6%26amp%3B5%26amp%3B-9%5C%5C8%26amp%3B7%26amp%3B-6%5C%5C2%26amp%3B4%26amp%3B-3%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}6&5&-9\\8&7&-6\\2&4&-3\end{array}\right]")
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a)
det = (- 5) x (- 6) - (- 3) x (- 8)
det = 30 - (24)
det = 6
b)
6 5 - 9 6 5
8 7 - 6 8 7
2 4 - 3 2 4
det = - 126 - 60 - 288 + 120 + 144 + 126
det = - 474 + 390
det = - 84
det = (- 5) x (- 6) - (- 3) x (- 8)
det = 30 - (24)
det = 6
b)
6 5 - 9 6 5
8 7 - 6 8 7
2 4 - 3 2 4
det = - 126 - 60 - 288 + 120 + 144 + 126
det = - 474 + 390
det = - 84
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