- #1

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One of the problems I couldn't do was to find [tex]lim_{x \to 16} \frac{4 - \sqrt{x}}{x - 16}[/tex]. I vaguely remember that I am supposed to multiply by the conjugate [tex]\frac{x+16}{x+16}[/tex], but then what?

All the others were similar to the above, in that it was trivial to get a diff of squares on the bottom, I just couldn't remember what to do after I got the diff of squares on the bottom.