Question

Pergunta 3, alguém pode me ajudar ?

Answer 1

A = $\left[\begin{array}{ccc} a_{11} & a_{12} \\ a_{21} & a_{22} \\\end{array}\right]$

A = $\left[\begin{array}{ccc}-2.1+1&-2.1+2\\-2.2+1&-2.2+2\\\end{array}\right]$

A = $\left[\begin{array}{ccc}-2+1&-2+2\\-4+1&-4+2\\\end{array}\right]$

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

D = -1 . (-2) - (-3) . 0

D = 2