(a-3b)² (a-3b)² 3b-a
= - = = 3b-a
3b-a a-3b 1
x⁵-x⁴+2x³-x² x⁵-x⁴-x² -x 1
= = =
2x⁵+2x³-4x⁴-2x⁶ 2x⁵-4x⁴-2x⁶ -x-4x⁴ -4x⁴
3²ⁿ+2*3ⁿ+1 2+1 3
= = = 1²ⁿ
3³ⁿ+3²ⁿ 3²ⁿ 3²ⁿ
xy-x+y-1 y-1 1
= =
xy+2y-x-2 2y-2 y-1
ab²-ac² ab²-a b² b
c²-bc -bc -bc c
