# Thread: finding limits

1. ## finding limits

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

2. We may divide the numerator and denominator of the first limit by $u^4$ and of the second limit by $-x^3$.

3. when i divide by -x^3 in number 2 i get a 0 in the denominator, but that is wrong. i also got number 1 wrong again. i have 1 more chance for each question

4. Originally Posted by kyleu03
when i divide by -x^3 in number 2 i get a 0 in the denominator, but that is wrong. i also got number 1 wrong again. i have 1 more chance for each question
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 $t = -x$ and then consider $\lim_{t \to + \infty} \frac{\sqrt{4t^6 + t}}{-t^3 + 1}$. Now divide the numerator and denominator by $t^3$ and then take the limit. Again, if you show all your working first your mistakes (if any) can be pointed out.