Resolva a equação ![\left[\begin{array}{ccc}x&x+2\\5&7\\\end{array}\right] = 0](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dx%26amp%3Bx%2B2%5C%5C5%26amp%3B7%5C%5C%5Cend%7Barray%7D%5Cright%5D+%3D+0+ "\left[\begin{array}{ccc}x&x+2\\5&7\\\end{array}\right] = 0")
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Calculando o determinante :
| x x+2 |
| 5 7 | = 0
0 = (x.7) - ((x+2).5)
0 = 7x - (5x + 10)
0 = 7x - 5x - 10
10 = 2x
x = 10/2
x = 5 ok
| x x+2 |
| 5 7 | = 0
0 = (x.7) - ((x+2).5)
0 = 7x - (5x + 10)
0 = 7x - 5x - 10
10 = 2x
x = 10/2
x = 5 ok
Hipeng:
muito obrigado
Por nada !
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