A) ? 2
B) 8
C) ? 7
D) ? 8
Correct Answer: D
Solution :
For perpendicular vector \[\overrightarrow{A}.\overrightarrow{B}=0\] Þ \[(5\hat{i}+7\hat{j}-3\hat{k}).(2\hat{i}+2\hat{j}-a\hat{k})=0\] Þ \[10+14+3a=0\]\[\Rightarrow \] \[a=-8\]You need to login to perform this action.
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