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Math Help - Re-arranging formula

  1. #1
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    Re-arranging formula

    Hi guys I've been doing a dynamics problem and I am currently on the last little bit.

    Could someone please help me re-arrange this equation to make r the subject

    see attached
    Attached Files Attached Files
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  2. #2
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    Re: Re-arranging formula

    please can anyone help ?

    if the link doesnt work then please let me know
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  3. #3
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    Re: Re-arranging formula

    Quote Originally Posted by raldam View Post
    please can anyone help ?
    if the link doesnt work then please let me know
    I would like to try to help you.
    But, I will not open that file.
    Are you not able to type out the question?
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  4. #4
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    Re: Re-arranging formula

    Yer is there anyway to insert an equation, theres a few brackets, square roots and divides to type out and its difficult using the typical keyboard and people will probably get confused.

    thanks

    raldam
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  5. #5
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    Re: Re-arranging formula

    -200(r-0.42r/√(r^2+〖0.3〗^2 ))=-108r

    iv tried to copy and paste an equation from word, if that makes any sense to you ?
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  6. #6
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    Re: Re-arranging formula

    You need to learn to use LaTeX

    If it -200\left(r-\frac{0.42r}{\sqrt{r^2+(0.3)^2}}\right)=-108r
    [TEX] -200\left(r-\frac{0.42r}{\sqrt{r^2+(0.3)^2}}\right)=-108r [/TEX] is the above code.
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  7. #7
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    Re: Re-arranging formula

    arr ryt thanks for that, well yes that is the equation that I need to try and re-arrange to make r the subject.

    I've been trying for ages and keep getting complex formula, I keep getting the feeling though that it is quite simple
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  8. #8
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    Re: Re-arranging formula

    Quote Originally Posted by raldam View Post
    arr ryt thanks for that, well yes that is the equation that I need to try and re-arrange to make r the subject.
    I've been trying for ages and keep getting complex formula, I keep getting the feeling though that it is quite simple
    If r\ne 0 then that reduces to \frac{84}{\sqrt{r^2+.09}}=92
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  9. #9
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    Re: Re-arranging formula

    thanks for your help its much appreciated, but is that the furthest it can reduce to ?

    from the equation you posted is there anyway to obtain a value for r ?

    thanks
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  10. #10
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    Re: Re-arranging formula

    ignore the previous elementary question, Iv obtained my value for r

    if you could, could you explain how you simplified the expression ?

    thanks

    rob
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