(a+3) (a-3) (a^+9). find the product by uaing suitable identity
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Step-by-step explanation:
(a+3) (a-3) (a²+9)
=(a²-3²) (a²+9) [using identity a²-b²=(a+b)(a-b)]
=(a²-9)(a²+9)
={(a²)²}-9² [using identity........
=(a⁴-81)
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