(a+1)(a-1)(a+3)(a+5)-9怎样因式分解

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(a+1)(a-1)(a+3)(a+5)-9怎样因式分解
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(a+1)(a-1)(a+3)(a+5)-9怎样因式分解
(a+1)(a-1)(a+3)(a+5)-9怎样因式分解

(a+1)(a-1)(a+3)(a+5)-9怎样因式分解
(a+1)(a-1)(a+3)(a+5)-9
=﹙a²+4a-5﹚﹙a²+4a+3﹚-9
=﹙a²+4a﹚²-2﹙a²+4a﹚-24
=﹙a²+4a-6﹚﹙a²+4a+4﹚
=﹙a²+4a-6﹚﹙a+2﹚².

怎样因式分