find the product of the roots

5. x2 + 12x + 36 = 0 6. 15x2 - 7x-2=0 7. 12x2 - 5x-3 = 0 8. 6x2 - 7x = 3 9. 3x2 - 8x = 4 10. 2x2 = 3x + 20​