| (a+4)^2 | a^2+8a+16 |
| (a-5)^2 | a^2-10a+25 |
| (a+5)(a-5) | a^2-25 |
| (2a-1)^2 | 4a^2-4a+1 |
| (a+6)^2 | a^2+12a+36 |
| (a-10)^2 | a^2-20a+100 |
| (2a-3)^2 | 4a^2-12a+9 |
| (a-7)(a+7) | a^2-49 |
| (3a-1)(3a+1) | 9a^2-1 |
| (a-8)(a+8) | a^2-64 |
| (5a+3)^2 | 25a^2+30a+9 |
| (3a-4)(3a+4) | 9a^2-16 |
| (5a-3)^2 | 25a^2-30a+9 |
| (4a+1)(4a-1) | 16a^2-1 |
| (2a+7)^2 | 4a^2+28a+49 |
| (a-11)^2 | a^2-22a+121 |
| (6a+3)^2 | 36a^2+36a+9 |
| (3a-5)^2 | 9a^2-30a+25 |