Calculate the Limit

1. Sep 13, 2009

I don't know why I am stuck on this one?

$$\lim_{x\rightarrow 9}\frac{\sqrt{x}-3}{x-9}$$

I tried multiplying by the conjugate of both the Numerator, and then the denominator. Is there another 'trick' like that?

2. Sep 13, 2009

njama

Do a little substitution. What if x=t2 ?

3. Sep 13, 2009

rarkup

Try using the x2 - y2 = (x + y)(x - y) pattern on the denominator first.

4. Sep 13, 2009