因式分解:(X-1)(X-3)(X+3)(X+5)+20

2025-01-07 12:08:05
推荐回答(1个)
回答1:

=(x-3)(x+5)(x-1)(x+3)+20
=(x²+2x-15)(x²+2x-3)+20
=(x²+2x)²-18(x²+2x)+65
=(x²+2x-5)(x²+2x-13)