Question

1) Ache o valor dos determinantes: a)−5 2 3 −1 b)6 −4 2 3 c) 1+V5−121−V5 d) |5|

Answer 1

Resposta:

a) -1

b) 26

c) 120√5

d) 5

Explicação passo-a-passo:

a)

$\left(\begin{array}{ccc}-5&2\\3&-1\end{array}\right)=-5 \times -1 - 2 \times 3=-1$

b)

$\left(\begin{array}{ccc}6&-4\\2&3\end{array}\right)=6 \times 3 - (-4 \times 2)=26$

c)

$\left(\begin{array}{ccc}1&\sqrt{5}\\-121&-\sqrt{5}\end{array}\right)=1 \times -\sqrt{5}- \sqrt{5} \times -121 = 120\sqrt{5}$

d)

$\left(\begin{array}{ccc}5\end{array}\right)=5$