# Thread: finding f(a)

1. ## 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

2. Let $x^{\frac{1}{3}} = y$ and $a^{\frac{1}{3}} = b$, then:

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

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3. Thanks a lot m8. That was great.