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7. Factorize 16x2 - 81 by suitable identity.

Answer»

16x²-81=(4x²)²-(3²)²Since a²-b²=(a+b)(a-b)

(4x²)²-(3²)²=(4x²+9)(4x²-9)=(4x²+9)(2x+3)(2x-3)



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