题目内容
把多项式a2-b2+2a+1分解因式得( )
A.(a+b)(a-b)+(2a+1) | B.(a-b+1)(a+b-1) |
C.(a-b+1)(a+b+1) | D.(a-b-1)(a+b+1) |
a2-b2+2a+1
=a2+2a+1-b2,
=(a+1)2-b2,
=(a+1+b)(a+1-b).
故选:C.
=a2+2a+1-b2,
=(a+1)2-b2,
=(a+1+b)(a+1-b).
故选:C.
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