What is the norm of $< 5 , 7 , -2 >$ ?

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Answer 1 · 2016-03-13T16:11:32

$|| A ||=sqrt78$

$vec A=5 hat i+7 hat j-2 hat k$
$|| A ||=sqrt(5^2+7^2+(-2)^2)$
$|| A ||=sqrt(25+49+4)$
$|| A ||=sqrt78$

What is the norm of < 5 , 7 , -2 >< 5 , 7 , -2 >?