Evaluate $\lim_{x\to49} \frac{x-49}{\sqrt{x}-7}$ Evaluate $\lim_{x\to 49} \frac{x-49}{\sqrt{x}-7}$ 
I'm guessing the answer is 7 but again that is only a guess. I don't know how to solve this type of problem.
Please help.

$$
\lim_{x \to 49} \frac {x - 49}{\sqrt x - 7} = \lim_{x \to 49} \frac {(\sqrt x + 7)(\sqrt x - 7)}{\sqrt x - 7} = \lim_{x \to 49} (\sqrt x + 7) = 14
$$
