answer of 55


55 .       F a c t o r i s e   :   16 ( x + y ) 2   -   40 ( x + y )   ( x - y )   +   2 y ( x - y ) 2 ( 1 )     x + 9 y 2 ( 2 )     x - 9 y 2 ( 3 )     x + 3 y 2 ( 4 )     x - 3 y 2

Dear Student,


Hence option (2) is correct
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