1 3 1 3
------ - -------- = ------- * --------
k - 2 k + 2 k - 2 k + 2
k + 2 - 3(k - 2) 3
--------------------- = -----------------
(k - 2)(k + 2) (k - 2)(k + 2)
k + 2 - 3k + 6 3
--------------------- - -------------------- = 0
(k - 2)(k + 2) (k - 2)(k + 2)
k + 2 - 3k + 6 - 3
------------------------- = 0
(k - 2)(k + 2)
- 2k + 5 = 0 k - 2 ≠ 0
- 2k = - 5 k + 2 ≠ 0
k = 2,5