If a vector 2i+3j+8k is perpendicular to the vector 4i−4j+ak,then the value of a is
Solution:- Given that vector A=2i+3j+8k
and vector B =4i−4j+ak
According to question,
Vector A. Vector B =0
(2i+3j+8k).(4i−4j+ak) =0
⇒8-12+8a=0
⇒-4+8a=0
⇒8a=4
⇒a=4/8
⇒a=1/2 ans
