Question

2 - Calcule o valor dos seguintes determinantes


a) 2 5 4
6 5 8
D| 0 0 0



b)
1 3
B| 4 2

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Answer 1

D =  $\left[\begin{array}{ccc}2&5&4\\6&5&8\\0&0&0\end{array}\right]$ ⇒ [(2.5.0) + (5.8.0) + (4.6.0)] - [(4.5.0) + (5.6.0) + (2.8.0)] ⇒ [0 + 0 + 0] - [0 + 0 + 0] = 0

B = $\left[\begin{array}{ccc}1&3\\4&2\end{array}\right]$ ⇒ (1.2) - (3.4) ⇒ 2 -12 = -10