Q. 10 E4.8( 5 Votes )

# Find the product:

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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