What is #|| <-7, -7, -3 > - < 4 , 4, -1 > ||#?

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What is #|| <-7, -7, -3 > - < 4 , 4, -1 > ||#?

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Answer 1 · 2016-02-14T12:50:58

#|| <-11,-11,-2> || =sqrt 245#

Explanation:

#<-7,-7,-3> - <4,4,-1> = <-7-4,-7-4,-3-(-1)>#
#<-7,-7,-3> - <4,4,-1> = <-11,-11,-2>#
#|| <-11,-11,-2> || =sqrt((-11)^2+(-11)^2+(-2)^2)#
#|| <-11,-11,-2> || =sqrt(121+121+4)#
#|| <-11,-11,-2> || =sqrt 245#

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What is #|| <-7, -7, -3 > - < 4 , 4, -1 > ||#?

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