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Thread: a math exercise

  1. October 12th 2011, 01:09 AM #1
    Grobi93
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    a math exercise

    Hey guys, I would need help with this exercise, I have the half of this exercise done, but I just need to figure out how to write it down on the PC Thx!



    Oh, and x->~

    ~ wants to be infinity
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  2. October 12th 2011, 02:30 AM #2
    mr fantastic
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    Re: a math exercise

    Quote Originally Posted by Grobi93 View Post
    Hey guys, I would need help with this exercise, I have the half of this exercise done, but I just need to figure out how to write it down on the PC Thx!



    Oh, and x->~

    ~ wants to be infinity
    Note that

    x - \sqrt{x^2 - 10x} = (x - \sqrt{x^2 - 10x}) \frac{(x + \sqrt{x^2 - 10x})}{x + \sqrt{x^2 - 10x}}

    = \frac{10x}{x + \sqrt{x^2 - 10x}} = \frac{10}{1 + \sqrt{1 + \frac{10}{x}}}
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