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What is the dot product of #<5,4,-4># and #<-4,1,5 >#?

1 Answer

Mar 3, 2016

#a*b=4#

Explanation:

enter image source here
#a=<5,4,-4>" "b=<-4,1,5>#
#a*b=5*(-4)+4*1+(-4)*5#
#a*b=-20+4-20#
#a*b=4#

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