Question
Let 
Find a vector 
which is perpendicular to both 
Solution
Here 
Let 
Since 
is perpendicular to 
...(1)
and 
...(2)
Again 
...(3)
Multiplying (1) by 7 and (2) by -2, we get,
Adding, 
...(4)
Multiplying (1) by 2 and (3) by -1, we get,
Adding, 
From (4), 
From (1), 
