Question

alguem entendeu essa questão a letra b ta errada já tentei

O Produto Ab entre as matrizes A= (2 1), (-1 3) e B= (2 0), (1 4):

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Answer 1

Resposta:

Explicação passo a passo:

$\left[\begin{array}{cc}2&1\\-1&3\end{array}\right] .\left[\begin{array}{cc}2&0\\1&4\end{array}\right] =\left[\begin{array}{cc}2*2+1*1&2*0+1*4\\-1*2+3*1&-1*0+3*4\end{array}\right] \\\\\\\left[\begin{array}{cc}2&1\\-1&3\end{array}\right] .\left[\begin{array}{cc}2&0\\1&4\end{array}\right] =\left[\begin{array}{cc}4+1&0+4\\-2+3&0+12\end{array}\right]$

$\left[\begin{array}{cc}2&1\\-1&3\end{array}\right] .\left[\begin{array}{cc}2&0\\1&4\end{array}\right]=\left[\begin{array}{cc}5&4\\1&12\end{array}\right]$

Alternativa (e)