We need to find the value of "a", when two vectors are perpendicular.
We know a formula
If Two Line are represented bye vectors A = a1i+a2j+a3k
B=b1i+b2j+b3k are perpendicular
Then A.B=0
It means a1b1+a2b2+a3b3=0
The given lines are A=2i+aj+1k and B=4i−2j−2k are perpendicular.
So, 2(4) +a (-2) +1 (-2) = 0
2a = 6
a= 3.
Answer: a = 3
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