Question

(x-3)(x+3)(x2+9) find product​

Answer 1

Answer:

$(x - 3)(x + 3)(x {}^{2} + 9) = (x {}^{2} - 3 {}^{2} )(x {}^{2} + 9)$

$(x {}^{2} - 3 {}^{2} )(x {}^{2} + 9) = (x {}^{2} - 9)(x {}^{2} + 9)$

$(x {}^{2} - 9)(x {}^{2} + 9) = (x {}^{2} ) {}^{2} - (9) {}^{2}$

$= x {}^{4} - 81$

Hence answer is x^4 - 81

[the identity used here is (a+b)(a-b) = (a² - b²) ]

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