Question

5. Dadas as matrizes        A = [1   −2     05    −4     3]  e   B = [−3     6       129    −6      15] , determine :        a)  -2 . A          b)   1/3 . B

Answer 1

Resposta:

a)

$-2 \cdot A = -2 \cdot \left[\begin{array}{ccc}1&-2&0\\5&-4&3\end{array}\right] \\\left[\begin{array}{ccc}-2 \cdot 1&-2 \cdot-2&-2 \cdot0\\-2 \cdot5&-2 \cdot-4&-2 \cdot3\end{array}\right] \\\left[\begin{array}{ccc}-2&4&0\\-10&8&-6\end{array}\right]$

b)

$\frac{1}{3} \cdot \left[\begin{array}{ccc}-3&6&12\\9&-6&15\end{array}\right] \\\left[\begin{array}{ccc}\frac{-3}{3}&\frac{6}{3}&\frac{12}{3}\\\frac{9}{3}&\frac{-6}{3}&\frac{15}{3}\end{array}\right] \\\left[\begin{array}{ccc}-1&2&4\\3&-2&5\end{array}\right]$