Q8 of 36 Page 10

Find λ, if the vectors and are coplanar.[CBSE 2015]

Three vectors are said to be coplanar if their scalar triple product is 0


As, are coplanar.


∴ …(1)



Expand the determinant along the first row.



∴


∴ from equation 1,we get-



⇒


∴ λ = 21/3 = 7

More from this chapter

All 36 →
6

Find if and [CBSE 2014]

 7

If and , then find the projection of .[CBSE 2015]

 9

If and then find a unit vector parallel to the vector [CBSE 2016]

 10

Find and μ if

[CBSE 2016]