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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)
a (x + y) =a x + a y x2-4x+4=x(x-4)+4 10x2-5x=5x(2x-1) x2-16+3x=(x-4)(x+4)+3x
x2﹣9+6x=(x+3)(x﹣3)+6x (x+5)(x﹣2)=x2+3x﹣10 x2﹣8x+16=(x﹣4)2 6ab=2a•3b
4x+3y=7xy 3a2﹣2a2=1 3x2y﹣3yx2=0 2a3+4a3=6a6
2x+2y=2xy (x2y3)2=x4y5 (xy)2÷=(xy)3 2xy﹣3yx=xy
(x+3)(x-2)=x2+x-6 ax-ay-1=a(x-y)-1 8a2b3=2a2·4b3 x2-4=(x+2)(x-2)
(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