Question
Find the value of $a$ so that vectors $\mathbf{U}=a \mathbf{i}+6 \mathbf{j}$ and $\mathbf{V}=9 \mathbf{i}+12 \mathbf{j}$ are perpendicular.
Step 1
The dot product of two vectors $\mathbf{U}=a \mathbf{i}+6 \mathbf{j}$ and $\mathbf{V}=9 \mathbf{i}+12 \mathbf{j}$ is given by: $\mathbf{U} \cdot \mathbf{V} = a*9 + 6*12$ Show more…
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