Question

Calcule os determinantes:

A) [-4 8 ] B) [ 8 √3 ]
[ 1 -3] [√3 -7] (URGENTE)

Answer 1

Olá

A)

$~~~~~~ \left[\begin{array}{ccc}-4&8\\1&-3\\\end{array}\right] \\ \\ ((-4)\cdot(-3))-(1\cdot8) \\ ~~~ ~~~~~12~~~~~~~-~~~8 = \\ ~~~~~~~~~~ ~~~~~~~\boxed{\boxed{4}}$



B)

$\left[\begin{array}{ccc}8& \sqrt{3} \\ \sqrt{3} &-7\\\end{array}\right] \\ \\ \\ (8\cdot(-7))-( \sqrt{3} \cdot \sqrt{3} ) \\ -57~~~~~-~ ~~\mathtt{( \diagup\!\!\!\!\!\sqrt{3} )^\diagup\!\!\!\!^2}~~~~~~~(cancela~ a~ raiz) \\ \\ -57-3 ~=~\boxed{\boxed{-60}}$





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