Question

If two vectors 2i +3j - k and -4i -6j - ak are parallel to each other then value of a is?​

Answer 1

Answer:

With the help of vector product we can get our answer

Here if two vectors are perpendicular to each other so the dot product will be zero .

Here option A will be the answer as

(3i+5j)(5i-3j)= 15-15= 0

Thanks