Question I solved but there is not a model answer for it..
So just wanted to make sure it is correct.
L+M=9 , M-L= -6 , So, L^2 -M^2 =.....
M-L=-6 (Multiply all with -1)
Since, L^2 - M^2 (Different between 2 square) = (L-M) (L+M)
Therefore, 6*9 = 54.
So it is a choice question
here are all the choices: