Ответ:

  1. \(a^2+a=a(a+1)\);
  2. \(x^3-x^2=x^2(x-1)\);
  3. \(c^5+c^7=c^5(1+c^2)\);
  4. \(a^3-a^7=a^3(1-a^4)\);
  5. \(3m^2+9m^3=3m^2(1+3m)\);
  6. \(9p^3-8p=p(9p^2-8)\);
  7. \(4c^2-12c^4=4c^2(1-3c^2)\);
  8. \(5x^5-15x^3=5x^3(x^2-3)\);
  9. \(-12y^4-16y=-4y(3y^3+4)\).