| a) (x + 3)(x + 4) - (x + 6)(x + 1) = |
| x² + 7x + 12 - (x² + 7x + 6) = 6 |
| b) (y + 1)(y - 9) - (y - 2)(y - 6) = |
| y² - 8y - 9 - (y² - 8y + 12) = -21 |
| c) (x - 5)(x + 3) - (x + 7)(x - 9) = |
| x² - 2x - 15 - (x² - 2x - 63) = 48 |
| d) (8 - x)(x + 7) + (x - 10)(9 + x) = |
| 8x + 56 - x² - 7x + 9x + x² - 90 - 10x = -34 |
| e) (4x - 8)(5 + 3x) - (-4 - 2x)(14 - 6x) = |
| 20x + 12x² - 40 - 24x - (-56 + 24x - 28x + 12x²) = |
| 12x² - 4x - 40 - 12x² + 4x + 56 = 16 |
| f) (2a + 3)(1 - 3a) + (6a - 17)(4 + a) = |
| 2a - 6a² + 3 - 9a + 24a + 6a² -68 - 17a = -65 |
| |
| Überprüfung: 6 - 21 + 48 - 34 + 16 - 65 = -50 |
|
|
