Question

Matriz determinantes

resolva as equações.
2 3 -2
0 1 x =2
2 x -3

Answer 1

$\left|\begin{array}{ccc}2&3&-2\\0&1&x\\2&x&-3\end{array}\right| =2\\ \\ -6+6x+4-2x^2=2\\ \\ 2x^2-6x+4=0\\ \\ ou\\ \\ x^2-3x+2=0\\ \\ \Delta=(-3)^2-4.1.2=9-8=1\\ \\ x=\frac{3\pm1}{2}\\ \\ x_1=1\\ \\ x_2=2$