Question

a)      x= l -8    6  l  + l  9   -3  l  ?

               l -7    -9 l     l  0     7 l 

 

                   

   b)    x=l -8  -7 l - l 6  -8 l ?

               l -5  -4 l   l -3  2 l

Answer 1

$x = \left[\begin{array}{cc}1&3\\-7&-2\\\end{array}\right]$

$x = \left[\begin{array}{cc}-14&1\\-2&-6\\\end{array}\right]$

Answer 2

a)
$X= \left[\begin{array}{ccc}-8&6\\-7&-9\end{array}\right] + \left[\begin{array}{ccc}9&-3\\0&7\end{array}\right]= \left[\begin{array}{ccc}-8+9&6+(-3)\\-7+0&-9+7\end{array}\right]=$$\left[\begin{array}{ccc}1&3\\-7&-2\end{array}\right]$

b)

$X= \left[\begin{array}{ccc}-8&-7\\-5&-4\end{array}\right] - \left[\begin{array}{ccc}6&-8\\-3&2\end{array}\right] = \left[\begin{array}{ccc}-8-6&-7-(-8)\\-5-(-3)&-4-2\end{array}\right] =$$\left[\begin{array}{ccc}-14&1\\-2&-6\end{array}\right]$