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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)
x2-4x+4 1+4x2 4y2+4y-1 x2+xy+y2
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x2+2xy-y2 -xy+y2 -x2+2xy+y2 x2+xy+y2
(x+5)(x-5)=x2-25 x2+x+1=x(x+1)+1 -2x2-2xy=-2x(x+y) 3x+6xy+9xz=3x(2y+9z)
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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