Question

Determine AB. obrigado (a).

Answer 1

3 + 12 + 2 ; 0 - 6 + 12
0 + 20 - 1 ; 0 - 10 - 6 
Logo:
AB = 
(17    6 )
(19  -16)

Answer 2

$A=\begin{bmatrix}1&3&2\\0&5&-1\end{bmatrix}$

$B=\begin{bmatrix}3&0\\4&-2\\1&6\end{bmatrix}$

$A.B = \begin{vmatrix}1.3+3.4+2.1&1.0+3.(-2)+2.6\\0.3+5.4-1.1&0.0+5.(-2)-1.6\end{vmatrix}$

$A.B=\begin{vmatrix}17&6\\19&-16\end{vmatrix}$