Question

a) [ 1 0
0 1 ]

b) [ 4 4
1 2 ]

c) [ -4 -4
-1 -2 ]

d) [ 1 1
8 2 ]

precisaria entregar hoje, alguém? ​

Answer 1

Resposta:

A alternativa que mais se aproxima da resposta correta é a letra d (talvez tenha esquecido de transcrever os sinais negativos).

Explicação passo-a-passo:

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$A=\left[\begin{array}{cc}2&1\\-3&4\end{array}\right]\\\\\\B=\left[\begin{array}{cc}0&-1\\2&5\end{array}\right] \quad \rightarrow \quad B^t=\left[\begin{array}{cc}0&2\\-1&5\end{array}\right]\\\\\\C=\left[\begin{array}{cc}3&0\\6&1\end{array}\right]$

$A-B^t-C=\left[\begin{array}{cc}2&1\\-3&4\end{array}\right]-\left[\begin{array}{cc}0&2\\-1&5\end{array}\right]-\left[\begin{array}{cc}3&0\\6&1\end{array}\right]\\\\\\A-B^t-C=\left[\begin{array}{cc}2-0-3&1-2-0\\-3-(-1)-6&4-5-1\end{array}\right]\\\\\\A-B^t-C=\left[\begin{array}{cc}-1&-1\\-8&-2\end{array}\right]$