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Math Help - first principle

  1. #1
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    first principle

    Hi,can someone help me in finding the limit for (5x)^3/2 using first principle.
    ((5x+h)^3/2-(5x)^3/2)/h
    This is all i got and then I am stuck on it.
    Help would be greatly appreciated.
    Thanx
    One more
    (3x+5)^3/2
    Thanx in advance
    one more question:how can someone delete a forum?
    Last edited by crystal91; January 22nd 2010 at 10:01 AM.
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  2. #2
    MHF Contributor

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    Recall that \sqrt{a^3}-\sqrt{b^3}=\frac{a^3-b^3}{\sqrt{a^3}+\sqrt{b^3}}.
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  3. #3
    MHF Contributor

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    You appear to be wanting to find, not the limit, but the derivative. And you have also posted this under "Algebra and PreAlgebra". Please to not post the same question in different places.
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