(a²-3)(a²+7)+16因式分解

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(a²-3)(a²+7)+16因式分解
(a²-3)(a²+7)+16因式分解

(a²-3)(a²+7)+16因式分解

(a²-3)(a²+7)+16
=a^4+4a²-21+16
=a^4+4a²-5
=(a²+5)(a²-1)
=(a²+5)(a-1)(a+1)