Question

determine o X alguém pode mim ajudar

Answer 1

$\left[\begin{array}{ccc}1&3\\3&x\end{array}\right] =0 \\ \\ 9 - x = 0 \\ x = 9$

$\left[\begin{array}{ccc}1&x\\-1&7\end{array}\right] = 2\\ \\ 7 + x = 2 \\ x = -5$

$\left[\begin{array}{ccc}x&1\\0&2\end{array}\right]+ \left[\begin{array}{ccc}1&0\\6&x\end{array}\right]=12 \\ \\ \left[\begin{array}{ccc}x+1&1\\6&2+x\end{array}\right]=12\\ \\ 2x+x^2+2+x=12 \\ x^2+3x+2=12\\ x^2+3x-10=0 \\ x = -5 \ \ ou \ \ x = 2$