3x2-2(2a+1)x+a2-1
=3x²-(4a+2)x+(a+1)(a-1)
=3x²+(-3a-3-(a-1)]x+(a+1)(a-1)
=3x²+[-3(a+1)-(a-1)]x+(a+1)(a-1)
=(3x-a+1)(x-a-1)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
祝你学习进步,更上一层楼!
不明白请及时追问,满意敬请采纳,O(∩_∩)O谢谢~~
3x2-2(2a+1)x+a2-1
=3x²-(4a+2)x+(a+1)(a-1)
=3x²+(-3a-3-(a-1)]x+(a+1)(a-1)
=3x²+[-3(a+1)-(a-1)]x+(a+1)(a-1)
=(3x-a+1)(x-a-1)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
祝你学习进步,更上一层楼!
不明白请及时追问,满意敬请采纳,O(∩_∩)O谢谢~~