| 2a+2 |
| a-1 |
| a2-1 |
| a2-2a+1 |
| 3 |
| 2(a+1) |
| a-1 |
| 1 |
| a+1 |
| (a+1)(a-1) |
| (a-1)2 |
| 2 |
| a-1 |
| (a+1)(a-1) |
| (a-1)2 |
| a+3 |
| a-1 |
| 3 |
3+4
| ||
| 3 |
| 5 |
| x+2 |
| x-3 |
| 2x+4 |
| 2 |
| x2-x |
| x+1 |
| x2-1 |
| x2-2x+1 |
| a2-4 |
| a |
| a+2 |
| a2+a |
| 3 |
| 2 |
| a-b |
| a |
| 2ab-b2 |
| a |
| 3 |
| 3 |
| 4 |
| x-2 |
| x2-9 |
| x2-1 |
| 3-x |
| x2+x |
| a-b |
| a+2b |
| a2-b2 |
| a2+4ab+4b2 |
| 1 |
| x-1 |
| x |
| x2-1 |
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