Rozwiąż nierówność:
| x2+9x+8 | ||
| | | ≥ 1 | |
| x2−9x+8 |
| x2+9x+8 | |(x+1)*(x+8)| | |||
| | | ≥ 1 => | ≥ 1 | ||
| x2−9x+8 | |(x−1)*(x−8)| |
| x2+9x+8 | ||
2) −1≥ | ≥1
| |
| x2−9x+8 |
| x2+9x+8 | x2+9x+8 | |||
2a) | ≤−1 ... | +1≤0
| ||
| x2−9x+8 | x2−9x+8 |
| x2+9x+8+x2−9x+8 | ||
≤0 ... 2(x2+8)(x2−9x+8)≤0 ... x2−9x+8≤0
| ||
| x2−9x+8 |