Verified answer

(a-3)(a-4)(a²-7a+12)= (a-3)(a³-7a²+12a-4a²+28a-48)=(a-3)(a³-11a²+40a-48)=a^4-11a³+40a²-48a-3a³+33a²-120a+144= a^4+8a³+73a²-168a+144

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