Answer :

First solving (2x – y) (2x+y)

Using the identity (a +b) (a–b) = a2 – b2


Here a = 2x and b = y


= (2x)2 – y2


= 4x2 – y2


Now solving (4x2 – y2 ) (4x2 + y2)


Again using the identity (a +b) (a–b) = a2 – b2


Here a = 4x2 and b = y2


= (4x2)2 – (y2)2


= 16 x4 – y4


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