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Do you know l'hopital's rule?

That should really be enough, in my opinion.

Or the definition of derivative.

Hmm, the definition of derivative doesn't apply here. NVM

surprisingly enough, we havent covered derivatives yet. or that rule

Darn.

You should rationalize the numerator. Must help.

Yay, rationalizing helped me.
Shubham, Y U NO REPLY TWO SECONDS LATER?

I may delete my comment if you ask for it! ;)

No, you have your credit.

:-P

try
\[\frac{\sqrt{x^2+49}-25}{x-24}\times \frac{\sqrt{x^2-49}+25}{\sqrt{x^2-49}+25}\]

Yes, that's what I did there. Conjugation for the win.

ok that was wrong!!

No it wasn't?

\[\frac{\sqrt{x^2+49}-25}{x+24}\times \frac{\sqrt{x^2+49}+25}{\sqrt{x^2+49}+25}\] is more like it

-49+625 = -576 = -(24^2)
Does it help ?

yes!
I'm so bad at factoring, I dont ever seem to see stuff like that

Glad to have helped! ^_^