 1. (6x^{3}  4x^{2} + x  9)  (3x^{2} + 7x + 3)
 2. (3a^{2} + 2a  2)  (a^{2}  3a + 7)
 3. (3z^{2} + 4z)  (6z^{2}  2)
 4. (s^{2}  3)  (2s^{2} + 10s)
 5. (5x^{2}  2x  1)  (3x^{2}  5x + 7)
 6. 3(c – 4) – 5(c^{2} + 4c – 8)
 7. (6x^{2} – 5x + 4) – (10x^{2} – 4x + 7)
 8. (12x + 7y)  (x + 2y)
 9. (4x^{2} – 7x + 5) – (x^{2} + 11x – 9)
 10. (3x^{2} + 7x – 6)  (x^{2} – 11x + 15)
