Question

Obter a matriz A = (aij)2x2 definida por aij = 3 i - j.

Answer 1

Resolução da questão, veja:

$aij = 3i-j\\\\\\\ a_{_{11}} = 3~\cdot~1-1\\\\ a_{_{11}} = 3-1\\\\ a_{_{11}} = 2\\\\\\ a_{_{12}} = 3~\cdot~1-2\\\\ a_{_{12}} = 3-2\\\\ a_{_{12}} = 1\\\\\\ a_{_{21}} = 3~\cdot~2-1\\\\ a_{_{21}} =6-1\\\\ a_{_{21}} =5\\\\\\ a_{_{22}} = 3~\cdot~2-2\\\\ a_{_{22}} = 6-2\\\\ a_{_{22}} = 4.\\\\\\\\ \large\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\begin{vmatrix} 2&1 \\ 5&4 \end{vmatrix}}}}}}}}}}}}}}}$

Espero que te ajude. :).