| 1) | x2 -20x = 0 | 2) | x2 + 7x + 10 = 0 |
| 3) | x2 -3x = 0 | 4) | x2 -5x + 4 = 0 |
| 5) | x2 + 2x -168 = 0 | 6) | x2 -4x + 3 = 0 |
| 7) | x2 -20x + 96 = 0 | 8) | x2 + 10x + 25 = 0 |
| 9) | x2 + 10x + 9 = 0 | 10) | x2 + 4x -45 = 0 |
| 11) | x2 -18x + 80 = 0 | 12) | x2 -3x -108 = 0 |
| 13) | x2 -11x + 28 = 0 | 14) | x2 + 22x + 121 = 0 |
| 15) | x2 -15x + 54 = 0 | 16) | x2 -10x -11 = 0 |
| 17) | x2 + 11x + 24 = 0 | 18) | x2 -12x -13 = 0 |
| 19) | x2 -8x = 0 | 20) | x2 -11x + 10 = 0 |
| 21) | x2 + 16x + 55 = 0 | 22) | x2 + 2x -99 = 0 |
| 23) | x2 -10x -56 = 0 | 24) | x2 -10x -11 = 0 |
| 25) | x2 + 8x + 7 = 0 | 26) | x2 + 4x -32 = 0 |
| 27) | x2 -8x -48 = 0 | 28) | x2 -x -72 = 0 |
| 29) | x2 + 21x + 110 = 0 | 30) | x2 + 9x -36 = 0 |
| 31) | x2 + 2x -80 = 0 | 32) | x2 + 4x -21 = 0 |
| 33) | x2 + 7x -60 = 0 | 34) | x2 + 5x + 6 = 0 |
| 35) | x2 + 3x -88 = 0 | 36) | x2 -5x -14 = 0 |
| 37) | x2 + 2x -24 = 0 | 38) | x2 -7x -60 = 0 |
| 39) | x2 -2x -120 = 0 | 40) | x2 -10x + 9 = 0 |
| 41) | x2 -11x + 28 = 0 | 42) | x2 -3x -4 = 0 |
| 43) | x2 + 18x + 56 = 0 | 44) | x2 + 12x -13 = 0 |
| 45) | x2 -21x + 90 = 0 | 46) | x2 -9x = 0 |
| 47) | x2 + 11x -60 = 0 | 48) | x2 -15x + 50 = 0 |
| 49) | x2 -4x + 3 = 0 | 50) | x2 -10x -11 = 0 |
Joke:
Terry shouted at his stubborn public-school-boy son: 'I pay thousands of pounds to your schoolmasters; but your classmates seem to be your mentors!'