分解因式:a2-b2-2b-1=_.
问题描述:
分解因式:a2-b2-2b-1=______.
答
a2-b2-2b-1
=a2-(b2+2b+1)
=a2-(b+1)2
=(a+b+1)(a-b-1).
故答案为:(a+b+1)(a-b-1).