| x | ||
f(x)= | ||
| x+1 |
| 1*(x+1) −(x*1) | 1 | |||
y'= | = | |||
| (x+1)2 | (x+1)2 |
| (x+1)2 − (2*1) | 1 | |||
y''= | = | −2 | ||
| (x+1)4 | (x+1)2 |
| 1 | |
−2 = 0 | |
| (x+1)2 |
| 1 | |
= 2 | |
| (x+1)2 |



| −2 | ||
druga pochodna to | ||
| (x+1)3 |
| x | x+1−1 | |||
f(x)= | = | |||
| x+1 | x+1 |
| −1 | ||
f(x)=1+ | funkcja homograficzna | |
| x+1 |
| −2 | ||
f ''(x)= | <0 ⇔x+1>0⇔x>−1 | |
| (x+1)3 |
| −2 | ||
f ''(x)>0⇔ | >0⇔x+1<0⇔x<−1 | |
| (x+1)3 |