Question

ALGUEM ME AJUDA POR FAVOR

Dadas as matrizes a e b a seguir, determine os termos da diagonal principal da matriz C, tal que, C = 2A - B:

Answer 1

$C = 2 \cdot A - B$

$C = 2 \cdot \left[\begin{array}{ccc}2&-1&2\\5&9&5\\9&0&-6\end{array}\right] - \left[\begin{array}{ccc}1&5&-2\\8&3&0\\4&-1&2\end{array}\right]$

$C = \left[\begin{array}{ccc}4&-2&4\\10&18&10\\18&0&-12\end{array}\right] - \left[\begin{array}{ccc}1&5&-2\\8&3&0\\4&-1&2\end{array}\right]$

$C = \left[\begin{array}{ccc}3&-7&6\\2&15&10\\14&1&-14\end{array}\right]$

Então os elementos da diagonal principal são 3, 15 e -14.