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Math Help - simple question - approximating a square root

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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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    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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