1.

Find the product.(2a + 3)(2a – 3) (4a2 + 9)

Answer»

(2a + 3)(2a – 3) (4a2 + 9) 

Identity (a + b)(a-b) = a2 – b2 

= [((2a)2 – 32)(4a2+9)2 

= (4a2 – 9)(4a2 + 9) 

= (4a2)2 – 92 

= 16a4 – 81



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