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    Functions: Simplifying an expression and limits

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    Let f(x) = sqrt of x, and show that in this case (f(x+h)-f(x))(f(x+h)+f(x))=h.
    Use this result to give a simplified expression for f(x+h)-f(x)/h.
    When f(x) = sqrt x what is lim h-->0 f(x+h)-f(x)/h ?

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    Solution Summary

    An expression is simplified and a limit is found. The solution is detailed and well presented.