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Homework Help: Need help

  1. Sep 6, 2008 #1
    limit as x approaches 0 of (square root(4+x^4)-2)/x^4)
    it says to solve algebraically by rationalizing the numerator
  2. jcsd
  3. Sep 6, 2008 #2


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    To rationalize it multiply numerator and denominator by sqrt(4+x^4)+2. Use (a+b)*(a-b)=a^2-b^2.
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