Question

Resolva a equação $\left[\begin{array}{ccc}1&x&1\\0&2&3\\-1&1&x\end{array}\right]$ = 2:

Answer 1

|........1........x..........1.....|.....1......x...|
|........0.......2.........3....|.....0.....2..|
|........-1........1..........x....|....-1......1..|

D=2x-3x-(-2+3+0)

D=-x-(+1)

D=-x-1

sendo D=2

-x-1=2

-x=2+1

-x=3

x=3/-1

x=-3

espero ter ajudado!

bom dia !

Answer 2

Olá!

$\left|\begin{array}{ccc}1&x&1\\0&2&3\\-1&1&x\end{array}\right| \left|\begin{array}{ccc}1&x\\0&2\\-1&1\end{array}\right|= 2 \\ \\ \Delta = 2 \\ (2x - 3x + 0) -(-2 + 3 + 0) = 2 \\ -x + 0 + 2 -3 = 2 \\ -x -1 = 2 \\ -x = 3$

$\boxed{\maths{ x = -3} }$