Question

помогите,пожалуйста)

Answer 1

$B=A-E=left(begin{array}{cc}7&3\-1&2end{array}right)-left(begin{array}{cc}1&0\0&1end{array}right)=left(begin{array}{cc}7-1&3-0\-1-0&2-1end{array}right)=\=left(begin{array}{cc}6&3\-1&1end{array}right)$