-6x3+30x2-48x
9a2+3a
xy+2x+3y
12x2y+13x+23y
ac-bc-a+b
x2-xy+x-2y-2
132x2+127x+30
x2+2x-3
4x2+8x+3
x2+2xy+y2
16x2-40x+25
a2-b2
49k2-144c2
36m2-169n2
m249-n264
-3ax+9a-18x+54
8x3-56x2+98x
x2+4y2+4xy-8x-16y+16
x3+2x2-5x-6
3x2+10x-81
3x2+10x+13
x2-31x+13