| x+y |
| (x+y)(x-y) |
| 1 |
| x-y |
| 8-3(a+2) |
| (a+2)(a-2) |
| 3a-2 |
| a2-4 |
| y(y-x)+xy |
| (x+y)(y-x) |
| y2 |
| y2-x2 |
| 2a-(a-3) |
| (a+3)(a-3) |
| 1 |
| a-3 |
| 1 |
| a-1 |
| a |
| a-1 |
| 32 |
| 3-n |
| n2 |
| 3-n |
| x+3 |
| x+2 |
| 2-x |
| x2-4 |
| (x+3)(x-2) |
| x2-4 |
| x-2 |
| x2-4 |
| x2+x-6-x-2 |
| x2-4 |
| x2-8 |
| x2-4 |
| x+3 |
| x+2 |
| x-2 |
| (x+2)(x-2) |
| x+3 |
| x+2 |
| 1 |
| x+2 |
| x+3-1 |
| x+2 |
| b2 |
| 2n-b |
| fn2 |
| b-2n |
| 1 |
| m+1 |
| 1 |
| m(m+1) |