Question

найти A-4B+E*A
A= 1 2
     -1 3
B = 0 -2
      -2 5
E= 1 0
       0 1

Answer 1

$left[begin{array}{ccc}1&2\-1&3end{array}right] -4 left[begin{array}{ccc}0&-2\-2&5end{array}right] + left[begin{array}{ccc}1&0\0&1end{array}right] * left[begin{array}{ccc}1&2\-1&3end{array}right] = \ = left[begin{array}{ccc}1&2\-1&3end{array}right] + left[begin{array}{ccc}0&8\8&-20end{array}right]+ left[begin{array}{ccc}1&2\-1&3end{array}right] = \ = left[begin{array}{ccc}2&12\6&-14end{array}right]$