Question

for what value of m given the magnitude of the vector mi+(m+1)j+(m-1)k is 2

Answer 1

Step-by-step explanation:

For two vectors to be perpendicular-

a.b=0

⟹(2i+mj−3k).(i−2j+k)=0

⟹2−2m−3=0

⟹m= -1/2