Número 33 e 34, matriz ivertivel???
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A matriz invertível tem determinante diferente de zero.
33)
![det~ \left[\begin{array}{cc}2&4\\-1&x\end{array}\right] \neq 0\\2*x-4*(-1) \neq 0\\2x+4 \neq 0\\2x\neq -4\\x\neq -4/2\\x \neq-2](https://tex.z-dn.net/?f=det%7E+%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D2%26amp%3B4%5C%5C-1%26amp%3Bx%5Cend%7Barray%7D%5Cright%5D+%5Cneq+0%5C%5C2%2Ax-4%2A%28-1%29+%5Cneq+0%5C%5C2x%2B4+%5Cneq+0%5C%5C2x%5Cneq+-4%5C%5Cx%5Cneq+-4%2F2%5C%5Cx+%5Cneq-2 "det~ \left[\begin{array}{cc}2&4\\-1&x\end{array}\right] \neq 0\\2*x-4*(-1) \neq 0\\2x+4 \neq 0\\2x\neq -4\\x\neq -4/2\\x \neq-2")
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![det ~ \left[\begin{array}{ccc}a&1&1\\2&-1&1\\1&1&-3\end{array}\right]\neq 0](https://tex.z-dn.net/?f=det+%7E++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Da%26amp%3B1%26amp%3B1%5C%5C2%26amp%3B-1%26amp%3B1%5C%5C1%26amp%3B1%26amp%3B-3%5Cend%7Barray%7D%5Cright%5D%5Cneq+0 "det ~ \left[\begin{array}{ccc}a&1&1\\2&-1&1\\1&1&-3\end{array}\right]\neq 0")
![a*det~ \left[\begin{array}{cc}-1&1\\1&-3\end{array}\right]-2*det~\left[\begin{array}
{cc}1&1\\1&-3\end{array}\right]+1*det~\left[\begin{array}{cc}1&1\\-1&1\end{array}\right]\neq 0](https://tex.z-dn.net/?f=a%2Adet%7E+%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D-1%26amp%3B1%5C%5C1%26amp%3B-3%5Cend%7Barray%7D%5Cright%5D-2%2Adet%7E%5Cleft%5B%5Cbegin%7Barray%7D%0A%7Bcc%7D1%26amp%3B1%5C%5C1%26amp%3B-3%5Cend%7Barray%7D%5Cright%5D%2B1%2Adet%7E%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D1%26amp%3B1%5C%5C-1%26amp%3B1%5Cend%7Barray%7D%5Cright%5D%5Cneq+0 "a*det~ \left[\begin{array}{cc}-1&1\\1&-3\end{array}\right]-2*det~\left[\begin{array}
{cc}1&1\\1&-3\end{array}\right]+1*det~\left[\begin{array}{cc}1&1\\-1&1\end{array}\right]\neq 0")
33)
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