| 1) | x2 -2x -80 = 0 | 2) | x2 + 5x -6 = 0 |
| 3) | x2 -9x + 20 = 0 | 4) | x2 -18x + 72 = 0 |
| 5) | x2 -x -30 = 0 | 6) | x2 + 5x -14 = 0 |
| 7) | x2 -6x -7 = 0 | 8) | x2 -x -72 = 0 |
| 9) | x2 + 15x + 56 = 0 | 10) | x2 + 17x + 72 = 0 |
| 11) | x2 + 7x -60 = 0 | 12) | x2 -8x -9 = 0 |
| 13) | x2 -19x + 90 = 0 | 14) | x2 + 15x + 36 = 0 |
| 15) | x2 + 3x -54 = 0 | 16) | x2 + 4x + 3 = 0 |
| 17) | x2 + 18x + 65 = 0 | 18) | x2 -9x + 8 = 0 |
| 19) | x2 -15x + 54 = 0 | 20) | x2 -41x = 0 |
| 21) | x2 -7x -98 = 0 | 22) | x2 + 4x + 3 = 0 |
| 23) | x2 -3x -88 = 0 | 24) | x2 + 5x -24 = 0 |
| 25) | x2 + 3x -70 = 0 | 26) | x2 -x -42 = 0 |
| 27) | x2 + 5x -36 = 0 | 28) | x2 + 18x + 72 = 0 |
| 29) | x2 -20x + 99 = 0 | 30) | x2 + 7x -60 = 0 |
| 31) | x2 + 3x -88 = 0 | 32) | x2 + 21x + 108 = 0 |
| 33) | x2 -12x + 27 = 0 | 34) | x2 + 15x + 54 = 0 |
| 35) | x2 + 3x -10 = 0 | 36) | x2 -3x -40 = 0 |
| 37) | x2 -4x -117 = 0 | 38) | x2 + 18x + 56 = 0 |
| 39) | x2 + 2x -120 = 0 | 40) | x2 -5x -14 = 0 |
| 41) | x2 + 14x + 45 = 0 | 42) | x2 + 20x + 84 = 0 |
| 43) | x2 -13x + 12 = 0 | 44) | x2 + 3x -10 = 0 |
| 45) | x2 -7x -8 = 0 | 46) | x2 -10x -11 = 0 |
| 47) | x2 -22x + 112 = 0 | 48) | x2 -4x = 0 |
| 49) | x2 -7x -8 = 0 | 50) | x2 + 12x + 32 = 0 |
Joke:
To err is human, to remember them in order, statistics; to plot them Excel!