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(x+1)(x﹣1)=x2﹣1 x2﹣y2+3=(x+y)(x﹣y)+3 x4﹣2x2+1=(x2﹣1)2 x2y﹣xy+x3y=xy(x﹣1+x2)
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4-x2+3x=(2-x)(2+x)+3x -x2+3x+4=-(x+4)(x-1) 1-4x+4x2=(1-2x)2 x2y-xy+x3y=x(xy-y+x2y)
(x+y+3)(x-y-1). (x+y-1)(x-y+3) (x+y-3)(x-y+1). (x+y+1)(x-y-3)
(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
(x-1)(x-2)=x2-3x+2 x2-3x+2=(x-1)(x-2) x2+4x+4=x(x一4)+4 x2+y2=(x+y)(x―y)
12abc-9a2b2=3abc(4-3ab) 3x2y-3xy+6y=3y(x2-x+2y) -a2+ab-ac=-a(a-b+c) x2y+5xy-y=y(x2+5x)