| b |
| a-b |
| a |
| a-b |
| a-a2 |
| a2-1 |
| a |
| a-1 |
| a+1 |
| a-1 |
| 1 |
| 4 |
| 8 |
| x+1 |
| x+3 |
| x+1 |
| 1 |
| 2x |
| 2 |
| x+3 |
| x-2 |
| x+2 |
| 16 |
| x2-4 |
| x+2 |
| x-2 |
| b-a |
| a-b |
| a-b |
| a-b |
| -a(a-1) |
| (a+1)(a-1) |
| (a-1)2 |
| a2 |
| (a+1)2 |
| (a-1)2 |
| a+1 |
| a |
| 1 |
| 64 |
| 1 |
| 4 |
| x2-9 |
| x+1 |
| x+1 |
| x+3 |
| (x+3)(x-3) |
| x+1 |
| x+1 |
| x+3 |
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