| 2x |
| x+1 |
| x2-2x+1 |
| x2-1 |
| x(x+1) |
| x+1 |
| 2x |
| x+1 |
| (x-1)2 |
| (x+1)(x-1) |
| x(x-1) |
| x+1 |
| (x+1)(x-1) |
| (x-1)2 |
| 1 |
| x |
| 1 |
| x2+x |
| a |
| a-1 |
| a2-a |
| a2-1 |
| 1 |
| a-1 |
| x |
| x-1 |
| y2+4y-2 |
| y2+4y-1 |
| a2-6a+9 |
| 4-b2 |
| 3-a |
| 2+b |
| a2 |
| 3a-9 |
| 3 |
| x-3 |
| x+1 |
| x2-2x+1 |
| x2-1 |
| 1 |
| a |
| 1 |
| b |
| 2a-3ab+2b |
| 3a+4ab+3b |
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