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Grade 11Vectors

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

Profile image of gaurav
8 Years agoGrade 11
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1 Answer

Profile image of Eshan
8 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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