Question

calcule e assinale abaixo o determinante da matriz diferença.

a) 22

b) 24

c) 26

d) 28​​

Answer 1

$\left[\begin{array}{ccc}-8&5\\10&-3\end{array}\right] -\left[\begin{array}{ccc}-2&-8\\8&5\end{array}\right]=\left[\begin{array}{ccc}-8-(-2)&5-(-8)\\10-8&-3-5\end{array}\right]=\left[\begin{array}{ccc}-6&13\\2&-8\end{array}\right]$

$Det=(-6).(-8)-2.13=48-26=22$