:3
| x + 1 | 2 | 2x + 1 | |||
+ | = | ||||
| x2 +2x −3 | x2 − 1 | 2x2 − 2x |
| x+1 | 2 | 2x+1 | |||
+ | − | =0 | |||
| (x−1)(x+3) | (x−1)(x+1) | 2x(x−1) |
| (x+1)2 | 2(x+3) | (2x+1)(x+1)(x+3) | |||
+ | − | =0 | |||
| (x−1)(x+3)(x+1) | (x−1)(x+1)(x+3) | 2x(x−1)(x+1)(x+3) |
| x+1 | 2 | 2x+1 | |||
+ | = | ||||
| (x+3)*(x−1) | (x−1)*(x+1) | 2x(x−1) |
| (x+1)2 | 2*(x+3) | 2x+1 | |||
+ | = | ||||
| (x+3)*(x−1)*(x+1) | (x+3)*(x−1)*(x+1) | 2x(x−1) |
| x2+2x+1+2x+6 | 2x+1 | ||
= | /*(x−1) | ||
| (x+3)*(x−1)*(x+1) | 2x(x−1) |
| x2+4x+7 | 2x+1 | ||
= | ⇔ | ||
| (x+3)*(x+1) | 2x |
| 4−2 | ||
x= | =1∉D lub x=3 | |
| 2 |