Question

ajudaaaaaaaaa alguém?​

Answer 1

Resposta:

1) $\mbox{A}= \begin{pmatrix} -1 & -4 & -7 & -10 \\ 1 & -2 & -5 & -8 \\ 3 & 0 & -3 & -6\end{pmatrix}$

2) R: Alternativa (C).

3) $a_{11}+a_{21}-a{13}+2a_{22}=\\-2+5-0+2.(-7)=\\-2+5-0+(-14)=\\3-0-14=\\3-14=\\=-11$