(x+3)(x²+9)(x-3)

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(x+3)(x²+9)(x-3)

(x+3)(x²+9)(x-3)
=(x+3)(x-3)(x²+9)
=(x²-9)(x²+9)
=x⁴-81

(x+3)(x²+9)(x-3)
=(x+3)(x-3)(x²+9)
=(x²-9)(x²+9)
=x^4-81