因式分解a2-b2-2b-1

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因式分解a2-b2-2b-1

a²-b²-2b-1
=a²-(b²+2b+1)
=a²-(b+1)²
=(a+b+1)(a-b-1)

(a+b+1)(a-b-1)

a2-b2-2b-1=a2-(b2+2b+1)=a2-(b+1)2=(a-b-1)(a+b+1)

(a+b+1)(a-b-1)