Mini Lecture
Factor completely.

  1. \(x^2-81\)

  2. \(x^2+49\)

  3. \(x^3-x^2\)

  4. \(27-r^3\)

  5. \(12x^2-11x+2\)

  6. \(100x^2-100x-600\)

  7. \(x^3+5x^2-9x-45\)