Question

Dada a matriz A (aij) do tipo 3×4 sabendo que aij 3i+j

Answer 1

$A=\begin{bmatrix}a_{11}&a_{12}&a_{13}&a_{14}\\a_{21}&a_{22}&a_{23}&a_{24}\\a_{31}&a_{32}&a_{33}&a_{34}\end{bmatrix}_{3\times4}\\\\\\A=\begin{bmatrix}(3+1)&(3+2)&(3+3)&(3+4)\\(6+1)&(6+2)&(6+3)&(6+4)\\(9+1)&(9+2)&(9+3)&(9+4)\end{bmatrix}\\\\\\A=\begin{bmatrix}4&5&6&7\\7&8&9&10\\10&11&12&13\end{bmatrix}$