Question

das as matrizes , calcule AxB?

Answer 1

Resposta:

$\sf \displaystyle A = \begin{bmatrix} 1 & 3 \\- 2 & 4\end{bmatrix}$

$\sf \displaystyle B = \begin{bmatrix}0 & - 2 \\- 3 & 1\end{bmatrix}$

Resolução:

$\sf \displaystyle A \times B = \begin{bmatrix} 1 & 3 \\- 2 & 4\end{bmatrix} \cdot \begin{bmatrix} 0 & -2 \\- 3 & - 1 \end{bmatrix} = \begin{bmatrix}1 \cdot 0+3 \cdot \left(-3\right) & 1\cdot \left(-2\right)+3 \cdot 1 \\2\cdot 0+4\cdot \left(-3\right) & 2 \cdot \left(-2\right)+4\cdot1\end{bmatrix}$

$\sf \displaystyle A \times B = \begin{bmatrix}-9 & 1 \\-12 & 0\end{bmatrix}$

Explicação passo-a-passo: