A) 5
B) 7
C) 4
D) 3/2
Correct Answer: A
Solution :
Two vectors perpendicular, therefore their dot product is zero \[(a\vec{i}+6\vec{j}-\vec{k})(7\vec{i}-3\vec{j}+17\vec{k})=0\]\[\Rightarrow \]\[7a-18-17=0\Rightarrow 7a=35\] \[a=5\]You need to login to perform this action.
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