$\displaystyle \frac{49-x}{\sqrt{x}-7}$

[tex]\lim_{x \to 49}[/Math]

$\displaystyle \frac{49-x}{\sqrt{x}-7}*\frac{\sqrt{x}+7}{\sqrt{x+7}}=\frac{49\sqrt{x}+ 343-x\sqrt{x}}{x-49}$

not sure where to go from here. I tried factoring out (x-49), but I still end up with an undefined answer.

What am I missing? (the answer is not undefined!)

Thanks!