Jawabanmu

2014-09-07T19:15:39+07:00
(x-4)(x+4)
_________
(x-5)(x+4)

= (x-4)
   ______
    (x-5)
2014-09-07T19:32:42+07:00
X² - 16 / x² - x - 20
= (x - 4) (x + 4) / (x + 4) (x- 5)
= x - 4 / x - 5