Răspuns:
Explicație pas cu pas:
1.A×B=
[tex]\left[\begin{array}{ccc}2&1\\1&2\\\end{array}\right] \cdot \left[\begin{array}{ccc}-3&-4\\-4&-3\\\end{array}\right]=\left[\begin{array}{ccc}-10&-11\\-11&-10\\\end{array}\right][/tex]
B×A=
[tex]\left[\begin{array}{ccc}-3&-4\\-4&-3\\\end{array}\right]\left[\begin{array}{ccc}2&1\\1&2\\\end{array}\right] \cdot=\left[\begin{array}{ccc}-10&-11\\-11&-10\\\end{array}\right][/tex]
2. B²=B×B=
[tex]\left[\begin{array}{ccc}1&0&1\\0&1&0\\1&0&1\end{array}\right] \cdot \left[\begin{array}{ccc}1&0&1\\0&1&0\\1&0&1\end{array}\right] =\left[\begin{array}{ccc}2&0&2\\0&1&0\\2&0&2\end{array}\right][/tex]
