Jawapan

2015-06-13T09:41:59+08:00
 \frac{-2x}{x + 1}  x^{2} +1  \\  \frac{-2x}{x + 1} (x + 1) (x -1)

Lalu X + 1 Habis
Jadi -2x . (x - 1)
-2x^2 + 2x