Question

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Answer 1

Resposta:

$\begin{pmatrix}-7&-3\\ 4&8\\ -1&-6\end{pmatrix}\begin{pmatrix}2&-5&3\\ 1&4&9\end{pmatrix}$

Multiplicar as  filas da primeira matriz pelas colunas da segunda matriz:

$=\begin{pmatrix}\left(-7\right)\cdot \:2+\left(-3\right)\cdot \:1&\left(-7\right)\left(-5\right)+\left(-3\right)\cdot \:4&\left(-7\right)\cdot \:3+\left(-3\right)\cdot \:9\\ 4\cdot \:2+8\cdot \:1&4\left(-5\right)+8\cdot \:4&4\cdot \:3+8\cdot \:9\\ \left(-1\right)\cdot \:2+\left(-6\right)\cdot \:1&\left(-1\right)\left(-5\right)+\left(-6\right)\cdot \:4&\left(-1\right)\cdot \:3+\left(-6\right)\cdot \:9\end{pmatrix}$

simplificar cada elemento:

$=\begin{pmatrix}-17&23&-48\\ 16&12&84\\ -8&-19&-57\end{pmatrix}$...

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