| 1 | 1 | |||
7(x + | ) − 2(x2 + | ) = 9 | ||
| x | x2 |
| 1 | 1 | |||
Pomocnicze obliczenia: (x + | )2 = x2 + 2 + | ⇒ | ||
| x | x2 |
| 1 | 1 | |||
⇒ x2 + | = (x + | )2 − 2 | ||
| x2 | x |
| 1 | 1 | |||
7(x + | ) − 2 * [ (x + | )2 − 2 ] = 9 | ||
| x | x |
| 1 | 1 | 1 | 1 | |||||
7(x + | ) − 2(x + | )2 + 4 = 9 ⇒ 2(x + | )2 − 7(x + | ) + 5 = 0 | ||||
| x | x | x | x |
| 1 | ||
Podstawienie: x + | = t | |
| x |