A = beginpmatrix2&−4&3\5&1&0endpmatrix, B = beginpmatrix1&4&−2\−3&3&−1endpmatrix
2B = 2 x beginpmatrix1&4&−2\−3&3&−1endpmatrix = beginpmatrix2&8&−4\−6&6&−2endpmatrix
A + 2B = beginpmatrix2&−4&3\5&1&0endpmatrix + beginpmatrix2&8&−4\−6&6&−2endpmatrix = beginpmatrix4&4&−1\−1&7&−2endpmatrix
