Determine x da seguinte matriz
x 2 x
3 -1 1 = 15
0 2 1
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Oi :)
![\left[\begin{array}{ccc}x&2&x\\3&-1&1\\0&2&1\end{array}\right]=15](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dx%26amp%3B2%26amp%3Bx%5C%5C3%26amp%3B-1%26amp%3B1%5C%5C0%26amp%3B2%26amp%3B1%5Cend%7Barray%7D%5Cright%5D%3D15 "\left[\begin{array}{ccc}x&2&x\\3&-1&1\\0&2&1\end{array}\right]=15")
![(x(-1)1)+(2(1)0)+(x(3)2)-[(x(-1)0)+(1(2)x)+(1*2*3)] =15 \\ \\ -x+0+6x-[0+2x+6]=15 \\ \\ 5x-2x-6=15 \\ \\ 3x=15+6 \\ \\ 3x=21 \\ \\ x= \frac{21}{3} \\ \\ x=7](https://tex.z-dn.net/?f=%28x%28-1%291%29%2B%282%281%290%29%2B%28x%283%292%29-%5B%28x%28-1%290%29%2B%281%282%29x%29%2B%281%2A2%2A3%29%5D+%3D15+%5C%5C++%5C%5C++-x%2B0%2B6x-%5B0%2B2x%2B6%5D%3D15+%5C%5C++%5C%5C+5x-2x-6%3D15+%5C%5C++%5C%5C+3x%3D15%2B6+%5C%5C++%5C%5C+3x%3D21+%5C%5C++%5C%5C+x%3D+%5Cfrac%7B21%7D%7B3%7D+%5C%5C++%5C%5C+x%3D7+ "(x(-1)1)+(2(1)0)+(x(3)2)-[(x(-1)0)+(1(2)x)+(1*2*3)] =15 \\ \\ -x+0+6x-[0+2x+6]=15 \\ \\ 5x-2x-6=15 \\ \\ 3x=15+6 \\ \\ 3x=21 \\ \\ x= \frac{21}{3} \\ \\ x=7")
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