If 2i +pj and 4i -2j are perpendicular, find the value of p.
- 2
- 3
-
4
- 5
The correct answer is: C
Explanation
(2i + pi) (4i - 2j) =0
2 x 4 - p x 2=0 ;
8-2p = 0; 2p-8;
p=4