Question

find the value of λ for which the vectors ,a vector=3i+j-2k and b=i+ λj-3k are perpendicular to each other

Answer 1

@hartnn

Answer 2

vectors perpendicular mean dot product =0
do you know how to find dot product ?

Answer 3

yes

Answer 4

then what you get for dot product of a and b ?

Answer 5

i guess 3+ λ+6

Answer 6

Set that equal to 0, as simple as that.

Answer 7

yes, now that =0 and get lambda ...