(a-2)(a²+2a+4)

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(a-2)(a²+2a+4)(a-2)(a²+2a+4)(a-2)(a²+2a+4)(a-2)(a²+2a+4)=a³+2a²+4a-2a&

(a-2)(a²+2a+4)
(a-2)(a²+2a+4)

(a-2)(a²+2a+4)
(a-2)(a²+2a+4)
=a³+2a²+4a-2a²-4a-8
=a³-8
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(a-2)(a²+2a+4)
=a^3-2^3=a^3-8