Question

If vector A and vector B are mutually perpendicular
Vector A= 5i cap + 7j cap + 3k cap
Vector B= 2i cap + 2j cap - ak cap
Find the value of a???

Answer 1

Please see the attachment

Answer 2

If vector A and B are mutually perpendicular then dot product of vector

A and B is 0

VectorA.VectorB = 0

10+14-3a=0

-3a=-24

a=8

Thanks