Jawabanmu

2014-03-31T18:42:10+07:00
1). lim  \frac{ x^{2} - x - 6}{2 x^{2} - x - 15} =
       x⇒3
      lim  \frac{(x - 3)(x + 2)}{(2x + 5)(x - 3)} = lim  \frac{(x + 2)}{(2x + 5)} =  \frac{3 + 2}{2.3 + 5}= \frac{5}{11}
2). lim  \frac{(x^3 - 8)}{ x^{2} + 2x - 8}=
     x ⇒2
     lim  \frac{(x - 2)( x^{2} + 2x - 4)}{(x + 4)(x - 2)} = lim  \frac{ x^{2} + 2x - 4}{x + 4} =  \frac{8}{6} =  1\frac{1}{3}