$(3 - 4 x) (3 + 4 x) (9 + 16 x^{2})$ . Simplify using identity.

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Solution

$(3 - 4 x) (3 + 4 x) (9 + 16 x^{2}) = (3^{2} - 4^{2} x^{2}) (9 + 16 x^{2}) = (9 - 16 x^{2}) (9 + 16 x^{2}) = 9^{2} - 16^{2} x^{4} = 81 - 256 x^{4}$ .

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