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因式分解(2a+5)(a+3)(a-3)(2a-7)-91

题目详情
因式分解
(2a+5)(a+3)(a-3)(2a-7)-91
▼优质解答
答案和解析
(2a+5)(a+3)(a-3)(2a-7)-91
=(2a+5)(a-3)(a+3)(2a-7)-91
=(2a²-a-15)(2a²-a-21)-91
=(2a²-a-15)(2a²-a-15-6)-91
=(2a²-a-15)²-6(2a²-a-15)-91
=(2a²-a-15-13)(2a²-a-15+7)
=(2a²-a-28)(2a²-a-8)
=(2a+7)(a-4)(2a²-a-8)