Let a =3 i + j - k and c =2 i -3 j +3 k . If b is a vector such that a = b c and | b |^2=50, then |72-| b + c...

Question

Let a =3 i + j - k and c =2 i -3 j +3 k . If b is a vector such that a = b c and | b |^2=50, then |72-| b + c |^2| is equal to __________

Accepted Answer

66

JEE Main 2023 Mathematics question