Question

Por favor me ajudem!! ​

Answer 1

Olá!

Vamos resolver!

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

1 · (-1) · 2 + 0 · 2 · x + 1 · 2 · 3 - 1 · (-1) · x - 0 · 2 · 2 - 1 · 2 · 3 = 2 · x - 1 · 0

-2 + 0 + 6 + x - 0 - 6 = 2x - 0

x - 2 = 2x

x - 2x = 2

-x = 2

x = -2

Resposta: x = -2

Abraços!