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(x+1)(x-1)=x2-1 x2-y2+3=(x+y)(x-y)+3 a2-4=(a-2)2 x2y-xy+x3y=xy(x-1+x2)
3a+2b=5ab 7a+a=8a 5y2-2y2=3 4x2y-2xy2=2xy
-x2+2xy-y2 x4-2x3y+x2y2 (x2-3)2-2(3-x2)+1 x2-xy+12y2
3a+4b=7ab 5y2-2y2=3 7a+a=8a 4x2y-2xy2=2xy
x2+6xy+9y2=(x+3y)2 2x2﹣4xy+9y2=(2x﹣3y)2 2x2﹣8y2=2(x+4y)(x﹣4y) x(x﹣y)+y(y﹣x)=(x﹣y)(x+y)
2x﹣x=x2 x+y=xy 2x2﹣x2=x2 6x﹣3x=3
3x+2y= 5xy -y2-y2=0 7x+7x=14x2 7x-7x=0
x2+2xy-y2 x2-xy+4y2 x2-xy+ x2—5xy+10y2
x2+2xy-y2 x2-xy+4y2 x2-xy+ x2—5xy+10y2
x2+2xy-y2 -xy+y2 -x2+2xy+y2 x2+xy+y2
3m﹣m=2 a2b﹣ab2=0 xy﹣2xy=﹣xy 2x+2y=5xy
3m﹣m=2 a2b﹣ab2=0 2x+3y=5xy xy﹣2xy=﹣xy
(y﹣1)(y+1)=y2﹣1 x2y+xy2﹣1=xy(x+y)﹣1 (x﹣2)(x﹣3)=(3﹣x)(2﹣x) x2﹣4x+4=(x﹣2)2
8x2y-24xy2=8xy(x-3y); ax+bx+ay+by=x(a+b)+y(a+b) 12x2y+14x2y2-2xy=2xy(6x+7xy-1); x3-8=(x-2)(x2+2x+4)
xy2+x2y=xy(x+y) (x+2)(x-2)=x2-4 b2+4b+3=b(b+4+) a2+5a-3=a(a+5)-3