作业帮 > 数学 > 作业

分解因式:(1)(x2+2x+3)(x2+2x+2)-30; (2)x2+2xy+y2-4x-4y-12;(3

来源:学生作业帮 编辑:拍题作业网作业帮 分类:数学作业 时间:2024/04/28 03:48:00
分解因式:
(1)(x2+2x+3)(x2+2x+2)-30; 
(2)x2+2xy+y2-4x-4y-12;
(3)x-y-x2+2xy-y2+2.
(1)(x2+2x+3)(x2+2x+2)-30
=(x2+2x)2+5(x2+2x)-14
=(x2+2x-2)(x2+2x+7);
(2)x2+2xy+y2-4x-4y-12
=(x+y)2-4(x+y)-12
=(x+y-6)(x+y+2);
(3)x-y-x2+2xy-y2+2
=(x-y)-(x-y)2+2
=-[(x-y)2-(x-y)-2]
=-(x-y-2)(x-y+1).