# What is  || < -2 , 3 , 6 > || ?

Mar 19, 2016

$| | < - 2 , 3 , 6 > | | = 7$
|| <-2,3,6> ||=?
$| | < a , b , c > | | = \sqrt{{a}^{2} + {b}^{2} + {c}^{2}}$
$| | < - 2 , 3 , 6 > | | = \sqrt{{\left(- 2\right)}^{2} + {3}^{2} + {6}^{2}}$
$| | < - 2 , 3 , 6 > | | = \sqrt{4 + 9 + 36}$
$| | < - 2 , 3 , 6 > | | = \sqrt{49}$
$| | < - 2 , 3 , 6 > | | = 7$