2y+8
a ^3 +3a ^2b+3ab ^2+b ^3
(a - b) ^2
(x + 2 ) ^3
x ^3 +6x ^2+12x +8
(x + y ) ^2
(x - 3 ) ^3
(a + b ) ^3
2(y+4)
x ^2 +2x y +y ^2
x^3- 9x ^2 y+27x y ^2-27y ^3
a ^2 -2ab + b ^2
