Question

calcule os determinantes:
a)7-43
1-10
5-41
b)2 1 1
1 2 1
1 1 2

Answer 1

a)
$\left|\begin{array}{ccc}7&-4&3\\1&-1&0\\5&-4&1\end{array}\right|= -7-12+15+4=0$

b)
$\left|\begin{array}{ccc}2&1&1\\1&2&1\\1&1&2\end{array}\right| =8+1+1-2-2-2=4$