2x2 + 2xy − y2 = 0
x2 + xy − y2 = 0
| 1 | 5 | |||
x2 + xy + | y2 − | y2 = 0 | ||
| 4 | 4 |
| 1 | √5 | |||
(x + | y)2 − ( | y)2 = 0 | ||
| 2 | 2 |
| 1 − √5 | 1 + √5 | |||
(x + | y)(x + | y) = 0 | ||
| 2 | 2 |
| −1 ± √5 | ||
x = | * y | |
| 2 |
| y2 | ||
x2 + xy − | = 0 | |
| 2 |
| 1 | 3 | |||
x2 + xy + | y2 − | y2 = 0 | ||
| 4 | 4 |
| 1 | √3 | |||
(x + | y)2 − ( | y)2 = 0 | ||
| 2 | 2 |
| 1 − √3 | 1 + √3 | |||
(x + | y)(x + | y) = 0 | ||
| 2 | 2 |
| −1 ± √3 | ||
x = | y | |
| 2 |
