Question

Bom dia, alguém me ajuda nesse exercício sobre matriz, obrigada.

Answer 1

$\left[\begin{array}{ccc}4*3&5*3&-9*3\\6*3&2*3&7*3\\\end{array}\right] \\ \\ 3*B= \left[\begin{array}{ccc}12&15&-27\\18&6&21\\\end{array}\right]  \\ \\ B+A=(2 *B)-B=\left[\begin{array}{ccc}8&10&-18\\12&6&14\\\end{array}\right]-\left[\begin{array}{ccc}4&5&-9\\6&2&7\\\end{array}\right] =\left[\begin{array}{ccc}4&5&-9\\6&2&7\\\end{array}\right] + \left[\begin{array}{ccc}2&3&8\\1&-4&0\\\end{array}\right] =\left[\begin{array}{ccc}6&8&-1\\7&-2&7\\\end{array}\right] \ \\ 2*B-B   \\ \\ 2*B=\left[\begin{array}{ccc}8&10&-18\\12&6&14\\\end{array}\right]$ \\ \\
B-B=\left[\begin{array}{ccc}8&10&-18\\12&6&14\\\end{array}\right] [/tex] -  \left[\begin{array}{ccc}4&5&-9\\6&2&7\\\end{array}\right] = \left[\begin{array}{ccc}4&5&-9\\6&2&7\\\end{array}\right]