(a+3) (a-3) (a×a+9) find the product with a suitable identity of algebra.
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using identify (x+y)(x-y)=x²-y²
(a+3)(a-3)(a²+9)
=(a²-9)(a²+9)
=(a⁴-81)
(a+3)(a-3)(a²+9)
=(a²-9)(a²+9)
=(a⁴-81)
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