Resposta:

Olá bom dia!

[tex]A = \left[\begin{array}{ccc}8&-7\\9&-2\end{array}\right][/tex]

[tex]B = \left[\begin{array}{ccc}-3&-6\\1&4\end{array}\right][/tex]

[tex]A + B = \left[\begin{array}{ccc}8+(-3)&-7+(-6)\\9+1&-2+4\end{array}\right][/tex]

Soma das matrizes A e B:

[tex]A + B = \left[\begin{array}{ccc}5&-13\\10&2\end{array}\right][/tex]