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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)
12abc-9a2b2c=3abc(4-3ab) 3x2y-3xy+6y=3y(x2-x+2y) -a2+ab-ac=-a(a-b+c) x2y+5xy+y=y(x2+5x+1)
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y(x-y)+x(x-y)=(x-y)(x+y) 25x2-4y2=(5x+2y)(5x-2y) 4x2+20x+25=(2x+5)2 a2(a-b)-2a(a-b)+b2(a-b)=(a-b)3
-5x(y+1) -5x(y-1) 5x(y+1) 5x(y-1)
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)