Find the value of λ for which and are perpendicular, where

i. and

ii. and

iii. and

iv. and

i)

Since these two vectors are perpendicular,their dot product is zero.

Ans:

ii)

Since these two vectors are perpendicular,their dot product is zero.

Ans: λ = 3

iii)

Since these two vectors are perpendicular,their dot product is zero.

Ans: λ = - 2

iv)

Since these two vectors are perpendicular,their dot product is zero.

Ans: λ = - 2