Question

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Dadas as matrizes A e B, determine A . B​

Answer 1

Explicação passo-a-passo:

$C=A.B\\\\C=\left[\begin{array}{ccc}1&1&2\\2&1&1\end{array}\right] .\left[\begin{array}{ccc}-1\\0\\1\end{array}\right] \\\\C=\left[\begin{array}{ccc}1.(-1)+1.0+2.1\\2.(-1)+1.0+1.1\end{array}\right] \\\\C=\left[\begin{array}{ccc}-1+0+2\\-2+0+1\end{array}\right]\\\\C=\left[\begin{array}{ccc}1\\-1\end{array}\right]$