阅读下面例题:把多项式x2-2xy+y2-2x+2y+1因式分解. 解:原式=(x-y)2-2(x-y)+1=(x-y-1)2 依照上述方法因式分解:x2+2xy+y2+4x+4y+4=_.

问题描述:

阅读下面例题:把多项式x2-2xy+y2-2x+2y+1因式分解.
解:原式=(x-y)2-2(x-y)+1=(x-y-1)2
依照上述方法因式分解:x2+2xy+y2+4x+4y+4=______.

x2+2xy+y2+4x+4y+4=(x+y)2+4(x+y)+4=(x+y+2)2
故答案为:(x+y+2)2