Question

find limit as X reaches infinity
5x^2 -8x-13

Answer 1

\(\infty\).

Answer 2

∞

Answer 3

My infinity looks much cooler than yours kushashwa23 :P

Answer 4

but if i take it's derivative and then try to find the answer, shouldn't that work?

Answer 5

wait :
\[∞\]

Answer 6

\[\color{red}{∞}\]

Answer 7

so 4/5 should be the answer right?

Answer 8

No! I think you're talking about L'Hopital's Rule, which is only applicable if you have something of the form \(\frac{0}{0}\) or \(\frac{\infty}{\infty}\).

Answer 9

anwarA now mine is cooler one :P
\[\color{ blue}{∞}\]

Answer 10

I agree, and you deserve a medal for that!

Answer 11

Call me Anwar.

Answer 12

ok thanks

Answer 13

but if i try to plot the graph, it has a zero gradient at x=8, so the limit would be where x= 4/5

Answer 14

and putting x=4/5 in the actual equation i can get the limit right?

Answer 15

ans will be
\[\infty\]

Answer 16

read my suggestion and let me know if my approach is wrong or not

Answer 17

I don't think I get your question. See the graph here http://bit.ly/ncbWjB. You can see that the function goes to \(\infty\) as you take large values of \(x\).

Answer 18

okay=)