Question

Preciso de ajuda nessa Questão!!!

Answer 1

$D=\left[\begin{array}{ccc}(1-7-2)&(2-8-3)&(3+9+4)\\(-4+12-6)&(5+6-7)&(6+5-1)\\(4+8-2)&(6+7-8)&(8+4-7)\end{array}\right]$

$D=\left[\begin{array}{ccc}-8&-9&16\\2&4&10\\10&5&5\end{array}\right]$