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What is the dot product of #<2,0,7># and #<-4,9,-1 >#?

1 Answer

Dec 22, 2015

-15

Explanation:

The usual dot product for the vectors #x=(x_1,x_2,...,x_n)# and #y =(y_1,y_2,...,y_n)# in #RR^n# is #x.y = sum_(i=1)^nx_iy_i#.

We apply it here : #(2,0,7).(-4,9,-1) = 2*(-4) + 0*9 + 7*(-1) = -15#

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