1.

\vec{A}=-2 i+3 j-4 \hat{k} \text { and } \vec{B}=3 \hat{i}-4 \hat{j}+5 \hat{k} . \text { Find } \vec{A B}

Answer»

Α.B = (-2î+3ĵ-4k̂).(3̂î-4ĵ+5k̂)= (-2*3) + (3*-4) + (-4*5)=-6-12-20=-38



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