Mathematics, 30.07.2019 22:10 cardenas08
A= [2, 3; 2, 1], b=[3; 5]. find ab & ba if possible
Answers: 3
![\left[\begin{array}{ccc}21\\11\end{array}\right]](/tpl/images/0152/0631/ddd7b.png)
and it's not possible to multiply BA.![A=\left[\begin{array}{ccc}2&3\\2&1\end{array}\right]](/tpl/images/0152/0631/86a5a.png)
, ![B=\left[\begin{array}{ccc}3\\5\end{array}\right]](/tpl/images/0152/0631/51a87.png)
![AB=\left[\begin{array}{ccc}2&3\\2&1\end{array}\right] \left[\begin{array}{ccc}3\\5\end{array}\right]](/tpl/images/0152/0631/8683d.png)
![AB=\left[\begin{array}{ccc}2\times 3+3\times 5\\2\times 3+1\times 5\end{array}\right]](/tpl/images/0152/0631/2e2b6.png)
![AB=\left[\begin{array}{ccc}6+15\\6+5\end{array}\right]](/tpl/images/0152/0631/d7b0b.png)
![AB=\left[\begin{array}{ccc}21\\11\end{array}\right]](/tpl/images/0152/0631/9e42e.png)
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A= [2, 3; 2, 1], b=[3; 5]. find ab & ba if possible...
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