Question

Dada as matrizes A= $\left[\begin{array}{ccc}2&-5\\-6&7\end{array}\right]$ e B= $\left[\begin{array}{ccc}2&5\\-3&6\end{array}\right]$
Determine:
2A

Answer 1

Oi Paula.
Basta multiplicar cada número da matriz A por 2.
$2A = \\ 2. \left[\begin{array}{ccc}2&-5\\-6&7\\\end{array}\right] = \left[\begin{array}{ccc}2.2&2.(-5)\\2.(-6)&2.7\end{array}\right] \\ 2A = \left[\begin{array}{ccc}4&-10\\-12&14\\\end{array}\right]$