hi guys,

Just started the topic on limits. I was just wondering whether somebody could help me go through the following questions.

Evaluate the following limits:

(a)$\displaystyle \lim_{x\rightarrow \infty } \frac{2x(x^2-1)}{x^2(5x-4)}$

(b)$\displaystyle \lim_{x\rightarrow \infty } \frac{x^3}{2x^2+7}$

(c)$\displaystyle \lim_{x\rightarrow -\infty } \frac{2x-1}{x^4+3x+1}$

Any help would be appreciated!