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I had a math test yesterday. It was pretty hard... This is one of the limits I wasn't able to do.

[tex]\lim_{x \rightarrow k} \frac {x\sqrt{x} - k\sqrt{k}}{x^{4}-k^{4}}[/tex]

I tried the Hopital rule, I tried multiplying the whole expression with the denominator. I didn't get to anything better.

Anyone knows how to do this kind of limits ? Thank you!

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# Homework Help: This was on my test

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