| a+1 |
| a2-a |
| 4 |
| 1-a2 |
| a2+2a-3 |
| a+3 |
| a+1 |
| a(a-1) |
| 4 |
| (1-a)(1+a) |
| (a+3)(a-1) |
| (a+3) |
| (a+1)2-4a |
| a(a+1)(a-1) |
| (a-1)2 |
| a(a+1)(a-1) |
| 1 |
| a-1 |
| 1 |
| a2+a |
| 1 |
| a2+a |
| x-5 |
| x2-9 |
| x2-2x-15 |
| x2+6x+9 |
| 1 |
| x-3 |
| 3 |
| 3 |
| x-1 |
| 1 |
| x+1 |
| x2-1 |
| x |
| 2 |
| 1 |
| 2 |
| a |
| a-1 |
| x4-16 |
| x4+8x2+16 |
| x2-x-2 |
| x2+4 |
| x2+x |
| x2+2x+1 |
| x-y |
| x+2y |
| x2-y2 |
| x2+4xy+4y2 |
| 3 |
| 3 |
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