1. Find the limit. (If you need to use - or , enter -INFINITY or INFINITY.)
2. Find the limit. (If you need to use - or , enter -INFINITY or INFINITY.)
lost
If you showed all your work we would have a better idea of where you're going wrong.
As for the second, I'd be inclinded to substitute $\displaystyle t = -x$ and then consider $\displaystyle \lim_{t \to + \infty} \frac{\sqrt{4t^6 + t}}{-t^3 + 1}$. Now divide the numerator and denominator by $\displaystyle t^3$ and then take the limit. Again, if you show all your working first your mistakes (if any) can be pointed out.