What is $|| < -4 , 8 , -5 > ||$ ?

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Answer 1 · 2016-03-27T18:33:00

$||< -4,8,-5 > ||=10,25 " unit"$

$||< -4,8,-5 > ||=sqrt((-4)^2+8^2+(-5)^2)$
$||< -4,8,-5 > ||=sqrt(16+64+25)$
$||< -4,8,-5 > ||=sqrt(105)$
$||< -4,8,-5 > ||=10,25$

What is || < -4 , 8 , -5 > || || < -4 , 8 , -5 > || ?