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Math Help - How would I attack this problem?

  1. #1
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    How would I attack this problem?

    f(x)= {\log}_{5}(5x^{2}+1)

    It's the base that's throwing me off.

    I'm looking for the derivative
    Last edited by Zanderist; March 13th 2010 at 08:24 PM.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Zanderist View Post
    f(x)= {\log}_{5}(5x^{2}+1)

    It's the base that's throwing me off.

    I'm looking for the derivative
    Use the change of base formula: \log_a b = \frac {\log_c b}{\log_c a}

    So that your function is:

    f(x) = \frac 1{\ln 5} \cdot \ln (5x^2 + 1)

    now continue
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