(9+14a^5)^2 2. (8a+3)^2 3. 36c^10+132c^5+121 4. (b+7d)^2 5. (5a^3-7)(5a^3+7) 6. (7c-9a)(7c+9a) 7. (13-6a)^2 8. (7+6n^3)(7-6n^3) 9. (k+14)(k-14)