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Calculate the Limit

  1. Sep 13, 2009 #1
    I don't know why I am stuck on this one?

    [tex]\lim_{x\rightarrow 9}\frac{\sqrt{x}-3}{x-9}[/tex]

    I tried multiplying by the conjugate of both the Numerator, and then the denominator. Is there another 'trick' like that?
     
  2. jcsd
  3. Sep 13, 2009 #2
    Do a little substitution. What if x=t2 ? :smile:
     
  4. Sep 13, 2009 #3
    Try using the x2 - y2 = (x + y)(x - y) pattern on the denominator first.
     
  5. Sep 13, 2009 #4
    doh.gif

    Thanks!
     
    Last edited by a moderator: Apr 24, 2017
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