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Thread: logarithm and exponential calculus

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    New Member otakuworld's Avatar
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    logarithm and exponential calculus

    So I missed out a couple of weeks on maths and missed out quite a bit
    I don't understand what is this "In" thing in the questions. I only have formulas with either "log" and "x", "d", "v" signs.
    https://prnt.sc/hjyiz4
    image1 (1).JPG
    These questions are the ones I'm stuck on. I don't need all of them done, I just need someone to use one of the examples and explain it? The words in blue are the answers. pls help if you can
    Last edited by otakuworld; 7 Dec 2017 at 4:33 AM.

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    I love trials pikachu975's Avatar
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    Re: logarithm and exponential calculus

    ln is natural log, i.e. it has a base of e instead of 10 like log.

    For differentiating you have ln(f(x)) so the derivative is f'(x)/f(x).

    For integrating you want to divide by the derivative of the power. Note for 4a that isn't possible as it has lnx rather than a form of x e.g. 4x so consider indice laws. A good thing to note is that e^lnx = x and ln(e^x) as they are the inverse of each other.

    NOTE: 2lnx = ln(x^2) but I'm assuming you know your log laws
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    Senior Member integral95's Avatar
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    Re: logarithm and exponential calculus

    Quote Originally Posted by otakuworld View Post
    So I missed out a couple of weeks on maths and missed out quite a bit
    I don't understand what is this "In" thing in the questions. I only have formulas with either "log" and "x", "d", "v" signs.
    https://prnt.sc/hjyiz4
    image1 (1).JPG
    These questions are the ones I'm stuck on. I don't need all of them done, I just need someone to use one of the examples and explain it? The words in blue are the answers. pls help if you can
    woah this isn't something you should do when you've just started learning it.

    But anyways in 4a) you need to know your indices and log law well.



    P.S holy crap you posted this at 4:10 am?!!
    “Smart people learn from their mistakes. But the real sharp ones learn from the mistakes of others.”
    ― Brandon Mull

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    New Member otakuworld's Avatar
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    Re: logarithm and exponential calculus

    thank you! and I didn't realise you could see the time I was up...shhh..ಠ_ಠ

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