Question

Efetue olhe a imagem

Answer 1

a)

$\left[\begin{array}{ccc}5&-3\\-1&4\end{array}\right] .\left[\begin{array}{ccc}3\\-2\end{array}\right] \\a_{11}=(5.3)+(3.-2) =11\\a_{21}=(-1.3)+4.-2)=-11\\\left[\begin{array}{ccc}11\\-11\end{array}\right]$

b)

$\left[\begin{array}{ccc}5&2\\-1&4\end{array}\right] . \left[\begin{array}{ccc}2&-1\\0&3\end{array}\right] \\a_{11}=(5.2)+(2.0)=10\\ a_{21}=(-1.2)+(4.0)=2\\a_{12}=(5.-1)+(2.3)=1\\a_{22}=(-1.-1)+(4.3)=13\\\left[\begin{array}{ccc}10&1\\2&13\end{array}\right]$