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Math Help - finding f`(a)

  1. #1
    Junior Member
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    finding f`(a)

    I am having trouble with the following problem.

    Let f(x) = cubedroot of x
    if a is not equal to 0, use f`(a) = lim as x approaches a {f(x)-f(a)}/(x-a) to find f`(a)

    I put it as lim as h approaches 0 (cubed root (a+h)-cubed root (a))/h but am unsure if this is correct and what I should do next.

    Thanks
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  2. #2
    Super Member
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    Let x^{\frac{1}{3}}  = y and a^{\frac{1}{3}}  = b, then:

    [LaTeX ERROR: Convert failed]

    Since b = a^{\frac{1}{3}}, we have:

    [LaTeX ERROR: Convert failed]
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  3. #3
    Junior Member
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    Thanks a lot m8. That was great.
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