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Thread: simple question - approximating a square root

  1. November 18th 2009, 02:51 PM #1
    ayarfal40
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    simple question - approximating a square root

    how do you approximate the differential of a square root? for example the square root of 23, something thats not as obvious.
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  2. November 18th 2009, 03:11 PM #2
    mr fantastic
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    Quote Originally Posted by ayarfal40 View Post
    how do you approximate the differential of a square root? for example the square root of 23, something thats not as obvious.
    f(x + h) \approx f(x) + h f'(x).

    For the example you give, f(x) = \sqrt{x}, x = 25 and h = -2.
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