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Mathematicians

Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
in General Chat
I know this should be in student but i need a quick fix. So can someone brainy please differentiate:

4lnx-x=0

I know i should be able to do it, but my brain has gone to sleep and i need it for my maths coursework. Thanks in advance.

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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    I could, but I won't.

    Unless you're going to put me in the footnotes of your maths coursework, then you are asking someone to plagiarise for you. No.

    Oh, and if you "know this should be in student", then why the heck isn't it? Do the rules not apply to you or something?
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    It's all Greek to me.
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    Godders wrote:
    I know this should be in student but i need a quick fix. So can someone brainy please differentiate:

    4lnx-x=0

    I know i should be able to do it, but my brain has gone to sleep and i need it for my maths coursework. Thanks in advance.

    This is easy and there are three ways of doing it, however, I can't really remember any of them...

    *Totally agrees with kermit*
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    if you can do it, try it in the morning when you might not be so tired. :)
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    You could use an abacus.
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    Hints:

    Treat x and 4lnX as 2 separate problems
    LnX differentiation is in the formulae booklet
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    everwonderwhy wrote:
    aww come on cut him a bit of slack

    But is it just me or does it sound like he wants to do his work for him?
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    I have no idea. I could give it to you in Russian but that's about as much help as I can be. Mrs. Thunderstruck is a mathmatician, I'll ask her. Then you can pay me for the answer.
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    solid_L wrote:
    Hints:

    Treat x and 4lnX as 2 separate problems
    LnX differentiation is in the formulae booklet


    Thanks. Iv done it now. Iv been doing maths coursework all day and im very tired and I am useless at logs anyway.
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    Logs are a bitch, differentiation and intergration are bitches, when you combine them you have a dooblé bitch
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    I only liked GCSE maths, and did well at it. A-Level maths was *SO* pointless. Yes, like i'm going to want to know the speed/velocity of a ball as i throw it in a non-linear curve across the park for my dog :chin: Never appealed to me one bit, but have the upmost respect for people who can actually do all this stuff o_O
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    Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    A-level simple mechanics is the pre-cursor to dynamics and stuff. If you jump straight to the hard stuff, you'll never get it.
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