Q. 10 B5.0( 7 Votes )

# Find the product:

First solving (2a + 3)(2a – 3)

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

Here a = 2a and b = 3

= (2a)2 –32

= 4a2 – 9

Now (4a2 – 9)(4a2 + 9)

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

Here a = 4a and b = 9

= (4a)2 – 9 2

= 16a4 – 81

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