Question

Dadas as matrizes
A=[-2 1 0 ] e B=[ 1 -2 4 ] calcule.
a) A.B
b) B.A

Answer 1

$A = \left[\begin{array}{ccc}-1&1&0\\\end{array}\right] e B= \left[\begin{array}{ccc}1\\-2\\4\end{array}\right]$

A)$\left[\begin{array}{ccc}-1&1&0\\\end{array}\right] . \left[\begin{array}{ccc}1\\-2\\4\end{array}\right] = -1-2+0 = -3$