What is #|| <-8, 5, 1> - < 4 , -7, 9 > ||#?

1 Answer
ali ergin
Feb 13, 2016

#<-12/sqrt 352 i,12/sqrt 352 j,-8/sqrt 352 k>#

Explanation:

#<(-8-4),(5-(-7)),(1-9)>#
#<-12,12,-8>#
#vec r=sqrt ((-12)^2+12^2+(-8)^2)#
#vec r=sqrt (144+144+64)#
#vec r=sqrt(352)#
#bar i=-12/sqrt 352#
#bar j=12/sqrt 352#
#bar k=-8/sqrt 352#
#<-12/sqrt 352 i,12/sqrt 352 j,-8/sqrt 352 k>#

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