Question

ache o valor dos determinantes:
[ 6 -4]
[ 2 3]

[1+√5 -1]
[ 2 1-√5]


[5]

Answer 1

$\left[\begin{array}{ccc}6&-4\\2&3\end{array}\right] \\ \\ (3 .6) - (2.-4) = 18 - (-8) = 18 + 8 = 26 \\ \\ \\ \\ \left[\begin{array}{ccc}1+ \sqrt{5} &-1\\2&1- \sqrt{5} \end{array}\right] \\ \\ (1+ \sqrt{5})(1 - \sqrt{5} )-(2.-1)=(1-5)-(-2)=-4+2=-2$

Espero ter ajudado.