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Hello,

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 =.....

 

 

My solution:

M-L=-6 (Multiply all with -1)

-M+L=6

(changing positions)

L-M=6 

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:

14

-14

54

-54

 Apr 30, 2019
 #1
avatar+100586 
+1

54 is correct   !!!

 

 

cool cool  cool

 Apr 30, 2019

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