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Find dot product of 2 vectors= A=i +2j+3k,B=2i+6j+3k? Hurry up answer my question friends

Find dot product of 2 vectors=
A=i +2j+3k,B=2i+6j+3k?
Hurry up answer my question friends
 

Grade:11

1 Answers

Eshan
askIITians Faculty 2095 Points
5 years ago
Dear student,

\vec{A}.\vec{B}=(a_x\hat{i}+a_y\hat{j}+a_z\hat{k}).(b_x\hat{i}+b_y\hat{j}+b_z\hat{k})

=a_xb_x+a_yb_y+a_zb_z

Hence in the given question,\vec{A}.\vec{B}=(1)(2)+(2)(6)+(3)(3)=23

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