Question

escreva a matriz A aij 2x2 em que aij = -i² -j.

Answer 1

$A=\begin{bmatrix}a_{11}&a_{12}\\a_{21}&a_{22}\end{bmatrix}\\\\\\A=\begin{bmatrix}-(1)^2-(1)&-(1)^2-(2)\\-(2)^2-(1)&-(2)^2-(2)\end{bmatrix}\\\\\\A=\begin{bmatrix}-(1)-1&-(1)-2\\-(4)-1&-(4)-2\end{bmatrix}\\\\\\A=\begin{bmatrix}-1-1&-1-2\\-4-1&-4-2\end{bmatrix}\\\\\\\boxed{A=\begin{bmatrix}-2&-3\\-5&-6\end{bmatrix}}$